View Full Version : Help? Math Q
Pen Marks
09-20-2008, 03:38 AM
:sl:
Here's the question,
Geometry Find the area of a triangle whose vertices have coordinates
(3, 1), (-4, 1), and (3, 5).
so how do i find the area of a triangle if i don't have the lenght of the sides? :-[
This is for Algebra 1 btw
Jazakallah khair in advance :D
Reply
Login/Register to hide ads. Scroll down for more posts
barney
09-20-2008, 03:44 AM
format_quote Originally Posted by
:: MuMiNaH ::
:sl:
Here's the question,
so how do i find the area of a triangle if i don't have the lenght of the sides? :-[
This is for Algebra 1 btw
Jazakallah khair in advance :D
Get the length of the sides by plotting the coordinates on graph paper, making a grid from -4 to +3 on the x axis and +1 to +5 on the Y axis?
Reply
Pen Marks
09-20-2008, 04:41 AM
i graphed it then what?
Reply
barney
09-20-2008, 04:50 AM
Umm, its half the baselength X perpedicular height.
My maths is really old!
Reply
Welcome, Guest!
Hey there! Looks like you're enjoying the discussion, but you're not signed up for an account.
When you create an account, you can participate in the discussions and share your thoughts. You also get notifications, here and via email, whenever new posts are made. And you can like posts and make new friends.
Sign Up
barney
09-20-2008, 04:50 AM
Reply
Pen Marks
09-20-2008, 05:28 AM
i know how to get the area of a triangle, but in this q, they don't give me the lenghts
Reply
A(3,1),B(-4,1)
AB(square)=({-4}-3)[square]+(1-1)[square] , I used this method to find the distance between the points and the apply the regular 1/2x(base)(height) to find the area
Reply
Qadri
09-20-2008, 07:37 PM
your length is the distance between -4 and 3 ... which is 7
your height is the difference between 5 and 1 ... which is 4
so your area is (0.5x7) x 4 = 14
Reply
The Ruler
09-20-2008, 07:38 PM
Length of a line with coordinates (x1, y1) and (x2, y2) = square root of [(x1-x2)^2+(y1-y2)^2]
So for example... (from your question)
length of line with coordinates (3,1) and (-4,1) = Square root of [(3+4)^2+(1-1)^2]
= sq root of [49+0]
= 7 units.
Reply
format_quote Originally Posted by
:: MuMiNaH ::
i know how to get the area of a triangle, but in this q, they don't give me the lenghts
They give you the points and you have to work out the lengths from there.
I believe the answer is 14 units.
Reply
Pen Marks
09-21-2008, 07:54 PM
ok thanks
how bout this one,
Write an expression containing three integers that has a value of zero. One integer should be inside absolute value symbols.
Reply
Abdu-l-Majeed
10-01-2008, 04:52 PM
@ Muminah:
I just saw this, I think I could have helped inshaAllah, anyway, it can help you in future.
1. question:
If you know how to solve matrixes, you use this matrix:
Or, use this:
2. question:
If I understood you right, this could be the solution:|-3| - 2 - 1The value of this expression is 0 and it contains 3 integers, one if them is in abs. brackets.
Reply
Hey there! Looks like you're enjoying the discussion, but you're not signed up for an account.
When you create an account, you can participate in the discussions and share your thoughts. You also get notifications, here and via email, whenever new posts are made. And you can like posts and make new friends.
Sign Up
Similar Threads
-
Replies: 14
Last Post: 09-09-2012, 01:07 PM
-
Replies: 5
Last Post: 10-26-2009, 09:03 PM
-
Replies: 11
Last Post: 11-22-2008, 02:54 AM
-
Replies: 19
Last Post: 12-22-2006, 12:10 AM
-
Replies: 11
Last Post: 11-17-2005, 05:28 AM
Powered by vBulletin® Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.