What you're asking of is about the nature of the angels in general. Once you understand their importance and function then it will be easier to know the answer to your questions.
First off, the angels are made out of light, just like Jinn are made out of fire and humans are made out of clay. We humans may be made out of clay, but we definitely are very different from clay. Thus, clay only really means that we are made from the substance, not that we are the substance. If a creature from outer space made out of, let's say, a gas, were to find out that humans are made out of a clay, then they would have a hard time imagining that themselves and would imagine some ghoulish looking beings that arose out of puddles of mud or clay itself. This is not the case. Similarly, angels are made out of light, but this does not mean that is exactly what they are. It only means they were fashioned from it somehow, just like jinn are made from fire, but they need no necessarily be the embodiment of fire.
My point is that angels are very different beings and we really don't know what their physical nature is. Therefore, when we learn that they record our deeds sitting on our shoulders, this does not mean they look or are shaped like us. It can't ever mean that because they are very different from us. Here is the Hadith about what humans, jinn and angels are made out of:
'A'isha reported that Allah's Messenger (may peace be upon him) said: The angels were born out of light and the Jinns were born out of the spark of fire and Adam was born as he has been defined (in the Qur'an) for you (i. e. he is fashioned out of clay). (Book #042, Hadith #7134)
(Sahih Muslim)
Now, to see why I am saying that angels are not shaped like us, it is because of the example of Jibril (as). He came in the form of a man sometimes:
It is narrated on the authority of Jabir that the Messenger of Allah (may peace be upon him) said: There appeared before me the apostles, and Moses was among men as if he was one of the people of Shanu'a, and I saw Jesus son of Mary (peace be upon him) and I saw nearest in resemblance with him was 'Urwa b. Mas'ud, and I saw Ibrahim (blessings of Allah be upon him) and I see your companions much in resemblance with him, i. e. his personality, and I saw Gabriel (peace be upon him) and I saw Dihya nearest in resemblance to him; but in the narration of Ibn Rumh it is Dihya b. Khalifa. (Book #001, Hadith #0321)
(Sahih Muslim)
At another time he saw that Gabriel (as) looked like a man that sat down with the group of the Sahaba of the Holy Prophet (saw), and he was not familiar to anyone. He looked like someone who had no signs of traveling on him. Notice how he looks different, not like Dihya al-Kalbi here in resemblance:
It is narrated on the authority of Yahya b. Ya'mur that the first man who discussed about Qadr (Divine Decree) in Basra was Ma'bad al-Juhani. I along with Humaid b. 'Abdur-Rahman Himyari set out for prilgrimage or for 'Umrah and said: Should it so happen that we come into contact with one of the Companions of the Messenger of Allah (peace be upon him) we shall ask him a bout what is talked about Taqdir (Division Decree). Accidentally we came across Abdullah ibn Umar ibn al-Khattab, while he was entering the mosque. My companion and I surrounded him. One of us (stood) on his right and the other stood on his left. I expected that my companion would authorize me to speak. I therefore said: Abu Abdur Rahman! there have appeared some people in our land who recite the Holy Qur'an and pursue knowledge. And then after talking about their affairs, added: They (such people) claim that there is no such thing as Divine Decree and events are not predestined. He (Abdullah ibn Umar) said: When you happen to meet such people tell them that I have nothing to do with them and they have nothing to do with me. And verily they are in no way responsible for my (belief). Abdullah ibn Umar swore by Him (the Lord) (and said): If any one of them (who does not believe in the Divine Decree) had with him gold equal to the bulk of (the mountain) Uhud and then, it (in the way of Allah), Allah would not accept it unless he affirmed his faith in Divine Decree. He further said: My father, Umar ibn al-Khattab, told me: One day we were sitting in the company of Allah's Apostle (peace be upon him) when there appeared before us a man dressed in pure white clothes, his hair extraordinarily black. There were no signs of travel on him. None amongst us recognized him. At last he sat with the Apostle (peace be upon him) He knelt before him placed his palms on his thighs and said: Muhammad, inform me about al-Islam. The Messenger of Allah (peace be upon him) said: Al-Islam implies that you testify that there is no god but Allah and that Muhammad is the messenger of Allah, and you establish prayer, pay Zakat, observe the fast of Ramadan, and perform pilgrimage to the (House) if you are solvent enough (to bear the expense of) the journey. He (the inquirer) said: You have told the truth. He (Umar ibn al-Khattab) said: It amazed us that he would put the question and then he would himself verify the truth. He (the inquirer) said: Inform me about Iman (faith). He (the Holy Prophet) replied: That you affirm your faith in Allah, in His angels, in His Books, in His Apostles, in the Day of Judgment, and you affirm your faith in the Divine Decree about good and evil. He (the inquirer) said: You have told the truth. He (the inquirer) again said: Inform me about al-Ihsan (performance of good deeds). He (the Holy Prophet) said: That you worship Allah as if you are seeing Him, for though you don't see Him, He, verily, sees you. He (the enquirer) again said: Inform me about the hour (of the Doom). He (the Holy Prophet) remarked: One who is asked knows no more than the one who is inquiring (about it). He (the inquirer) said: Tell me some of its indications. He (the Holy Prophet) said: That the slave-girl will give birth to her mistress and master, that you will find barefooted, destitute goat-herds vying with one another in the construction of magnificent buildings. He (the narrator, Umar ibn al-Khattab) said: Then he (the inquirer) went on his way but I stayed with him (the Holy Prophet) for a long while. He then, said to me: Umar, do you know who this inquirer was? I replied: Allah and His Apostle knows best. He (the Holy Prophet) remarked: He was Gabriel (the angel). He came to you in order to instruct you in matters of religion. (Book #001, Hadith #0001)
(Sahih Muslim)
In another narration, Jibril (as) is seen with six hundred wings. ---
Al-Shaibini reported to us: I asked Zirr b. Hubaish about the words of Allah (the Mighty and Great):" So he was (at a distance) of two bows or nearer" (al-Qur'an, Iiii 8). He said: Ibn Mas'ud informed me that, verily, the Apostle of Allah (may peace be upon him) saw Gabriel and he had six hundred wings. (Book #001, Hadith#0330)
(Sahih Muslim)
Narrated Aisha: Whoever claimed that (the Prophet) Muhammad saw his Lord, is committing a great fault, for he only saw Gabriel in his genuine shape in which he was created covering the whole horizon. (Book #54, Hadith #457)
(Sahih Bukhari)
In another Hadith it explains that this was like seeing come green carpet cover the sky:
Narrated Abdullah: Regarding the Verse: "Indeed he (Muhammad) did see. Of the Signs of his Lord, The Greatest!" (53.18) That the Prophet had seen a green carpet spread all over the horizon of the sky. (Book#54, Hadith #456)
(Sahih Bukhari)
In another narration, when the Holy Prophet (saw) first saw Jibril (as), he saw him sitting between Heaven and Earth.
Narrated Aisha: (the wife of the Prophet) The commencement (of the Divine Inspiration) to Allah's Apostle was in the form of true dreams in his sleep, for he never had a dream but it turned out to be true and clear as the bright daylight. Then he began to like seclusions, so he used to go in seclusion in the cave of Hira where he used to worship Allah continuously for many nights before going back to his family to take the necessary provision (of food) for the stay. He come back to (his wife) Khadija again to take his provision (of food) likewise, till one day he received the Guidance while he was in the cave of Hira. An Angel came to him and asked him to read. Allah's Apostle replied, "I do not know how to read." The Prophet added, "Then the Angel held me (forcibly) and pressed me so hard that I felt distressed. Then he released me and again asked me to read, and I replied, 'I do not know how to read.' Thereupon he held me again and pressed me for the second time till I felt distressed. He then released me and asked me to read, but again I replied. 'I do not know how to read.' Thereupon he held me for the third time and pressed me till I got distressed, and then he released me and said, 'Read, in the Name of your Lord Who has created (all that exists), has created man out of a clot, Read! And your Lord is the Most Generous. Who has taught (the writing) by the pen, has taught man that which he knew not." (96.1-5). Then Allah's Apostle returned with that experience; and the muscles between his neck and shoulders were trembling till he came upon Khadija (his wife) and said, "Cover me!" They covered him, and when the state of fear was over, he said to Khadija, "O Khadija! What is wrong with me? I was afraid that something bad might happen to me." Then he told her the story. Khadija said, "Nay! But receive the good tidings! By Allah, Allah will never disgrace you, for by Allah, you keep good relations with your Kith and kin, speak the truth, help the poor and the destitute, entertain your guests generously and assist those who are stricken with calamities." Khadija then took him to Waraqa bin Naufil, the son of Khadija's paternal uncle. Waraqa had been converted to Christianity in the Pre-lslamic Period and used to write Arabic and write of the Gospel in Arabic as much as Allah wished him to write. He was an old man and had lost his eyesight. Khadija said (to Waraqa), "O my cousin! Listen to what your nephew is going to say." Waraqa said, "O my nephew! What have you seen?" The Prophet then described whatever he had seen. Waraqa said, "This is the same Angel (Gabriel) who was sent to Moses. I wish I were young." He added some other statement. Allah's Apostle asked, "Will these people drive me out?" Waraqa said, "Yes, for nobody brought the like of what you have brought, but was treated with hostility. If I were to remain alive till your day (when you start preaching). then I would support you strongly." But a short while later Waraqa died and the Divine Inspiration was paused (stopped) for a while so that Allah's Apostle was very much grieved. Narrated Jabir bin 'Abdullah: While Allah's Apostle was talking about the period of pause in revelation. he said in his narration. "Once while I was walking, all of a sudden I heard a voice from the sky. I looked up and saw to my surprise, the same Angel as had visited me in the cave of Hira.' He was sitting on a chair between the sky and the earth. I got afraid of him and came back home and said, Wrap me! Wrap me!" So they covered him and then Allah revealed: 'O you, wrapped up! Arise and warn and your Lord magnify, and your garments purify and dessert the idols.' (74.1-5) Abu Salama said, "(Rijz) are the idols which the people of the Pre-lslamic period used to worship." After this the revelation started coming frequently and regularly. (Book #60, Hadith #478)
(Sahih Bukhari)
Interestingly, angels could have any number of wings, as it is said in the Holy Qur'an:
35:1 All the praises and thanks be to Allah, the (only) Originator [or the (Only) Creator] of the heavens and the earth, Who made the angels messengers with wings, two or three or four. He increases in creation what He wills. Verily, Allah is Able to do all things.
This is just about the very nature of angels. They are unlike us. ---
--- There is a Hadith in which Allah asks the angels questions, and the Hadith says itself that Allah asks them even though He knows the answer Himself already. The Qur'an says in it at some places that Allah is sufficient as a witness. This means Allah witnesses everything, despite employing angels.
Thus, the angels --- record even though Allah is All-Knowing because they are entrusted with the management and supervision of the affairs of the physical world (79:5).
As for the third question, --- He knows everything despite the angels recording on His behalf. So there is no duality to God. I hope that was clear, maybe I didn't understand your third question correctly.
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