Find the missing length of a right angle triangle

Question

A is fifteen and b is 20 what is c

I tried to use the Pythagorean theorem but I got 300 but that wasn't the answer which is it and please explain step by step

 

a.  35

b.  13.23

c.  625

d.  25

Please answer quickly 

 

Answer 1

I have already done this problem for you twice.

Why do you want to see it again?

 

A^2 + B^2 = C^2   <--- this is the Pythagorean theorem

 

15^2 + 20^2 = c^2  <--- the measure of the legs are given as A=15 and B=20

 

225 + 400 = c^2   <---  15^2 = 15*15 = 225; likewise 20^2 = 20*20 =400

 

625 = c^2 <---- adds them together

 

25 = c  <--- takes the positive square root of both sides because the length of the triangle cannot be negative

 

The length of the hypotenuse C = 25