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Someone hint how to find the legs in this 40-40-90 special right triangle?

Question

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Someone hint how to find the legs in this 40-40-90 special right triangle?

anonymous · Answer

its 30

kikuo · Answer

I don't want the answer. I would like you to explain the process. : ) 

@Luke1105

anonymous · Answer

ok its all 120% and do 45+45+_=120

kikuo · Answer

What's all 120?

anonymous · Answer

find the mising nember that will add up to 120

anonymous · Answer

120%

anonymous · Answer

the triangle it mesared to 120%

kikuo · Answer

Ah! I see what you're doing. 

My teacher would like me to use what we know about the hypotenuse to solve. 

Would you mind using that and guiding me? : )

kikuo · Answer

If you don't know how that's alright.

mrnood · Answer

I think the point you have missed is that the hypotenuse of a 45,45 triangle is always

L * sqrt(2)

So in you case you can immediately say the side is 8

the proof is from Pythagoras:

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