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Mathematics 13 Online
OpenStudy (anonymous):

if QP=25, MN=35, and SR=13, calculate the area of LMN.

OpenStudy (anonymous):

OpenStudy (anonymous):

i smell the stench of similar triangles

OpenStudy (anonymous):

to solve the area, you need base and height. base is MN and height is LS agree?

OpenStudy (anonymous):

height is LR*

OpenStudy (mertsj):

\[\frac{25}{35}=\frac{LS}{LS+13}\]

OpenStudy (mertsj):

Finally

OpenStudy (anonymous):

I'm still a little unsure.

OpenStudy (mertsj):

Solve that proportion. Reduce 25/35 then cross multiply and solve.

OpenStudy (anonymous):

LS = 32.5 , but what am I supposed to do with that?

OpenStudy (mertsj):

What are you trying to find?

OpenStudy (anonymous):

The area of △LMN.

OpenStudy (mertsj):

How do you find the area of a triangle?

OpenStudy (mertsj):

Is there a formula or something?

OpenStudy (anonymous):

½ × b × h

OpenStudy (mertsj):

What is the base of your triangle?

OpenStudy (anonymous):

Oh I get it now area is = 796.25 Thanks Mertsj!

OpenStudy (mertsj):

That seems too big. How did you get that?

OpenStudy (anonymous):

base is 35

OpenStudy (mertsj):

1/2(35)(32.5+13)=1/2(35)(45.5) Yep. Your answer is correct. Good job.

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