Question

Howto find area of a triangle??

It says if QP = 10, MN = 25, and LS = 8, calculate the area of triangle LMN

Answer 1

Use Heron's formula.

Answer 2

Which is?

Answer 3

With sides \(a,b,c\) let \(s = (a+b+c)/2\) the area is just \(\sqrt{s(s-a)(s-b)(s-c)}\)

Answer 4

Oh ok! thank you. Let me solve that real fast

Answer 5

Will you put the numbers in the equation? I'm getting 43. And thats not correct. Then i got 129 which isnt correct either

Answer 6

http://tinypic.com/r/2qjkobb/6


Thats what it looks like

Answer 7

area = base * height/2

when the lengths are scaled by n we get

area = nbase * nheight/2 = n^2 bh/2 as a proportion

Answer 8

in other words, you need to determine the lengths of the corresponding sides using ratios and proportionalities most likely

Answer 9

What does N mean? I really dont understand math at all.
Btw thanks for the help so far

Answer 10

I got 20 for line SR

Answer 11

n is just a variable i used to indicate a scaling factor. if you know the area of one of the triangles, and you can determine the scaling factor for the similar triangles; you can proportion out the areas as well

Answer 12

Ok. So I need to break the triangle up into two different triangles?

Answer 13

area LMN = area LQP time n^2

such the 10n=25, n=2.5

Answer 14

Ok. Let me find the area of the small triangle

Answer 15

I got 200

Answer 16

And then divide by 2 so 100

Answer 17

for the top?

Area LQP = QP*LS/2 = 10*8/2 = 40 for the top

Answer 18

Oh I did 25*8

Answer 19

Then what is our next step