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Rina8888 [55]
3 years ago
6

Find the missing value of a triangle one leg is 12 and the long side is 20 what is the other leg?

Mathematics
2 answers:
Burka [1]3 years ago
3 0
Simple,

using the Pythagorean Theorem...

a^{2} + b^{2} = c^{2}

You have the hypotenuse (C) and one of the legs (A)

So, plug in what you know...

12^{2}+ b^{2}  = 20^{2}

144+b^{2}=400

Now,isolate b^{2}

144+ b^{2} =400
-144                   -144

Leaving you with...

b^{2} =256

So, now, \sqrt{256}, to find what b is..

b=16

Thus, your answer.
solniwko [45]3 years ago
3 0
IF this is a 'right' triangle, then we can calculate an answer.
If it's NOT a right triangle, then no answer is possible.

I'm going to assume that it's a right triangle, because you did say
that one 'leg' is 12, and you want the length of the other 'leg'.   It's
common to refer to the two short sides of a right triangle as 'legs'.

In "Tales of Pythagoras", we learned that in a right triangle ...

                                            (Longest side)² = (one leg)²  +  (the other leg)²

In your triangle ...

                                               (20)²              =  (12)²  +  (the other leg)²

                                              (400)               =  (144) +  (the other leg)²

Subtract 144 from each side:  (The other leg)²  =  (400 - 144) = 256

                                             The other leg     =   √256  =  16 . 
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