Question

What is the length of the unknown leg in the right triangle?
a. $\sqrt{5}$
b. 5m
c. $\sqrt{45}$
d. 15m

Answer 1

Using the Pythagorean theorem:

25^2 = 20^2 + b^2

625 = 400 + b^2

b^2 = 625 - 400

b^2 = 225

b = 15

The answer is d. 15m

Answer 2

b^2 = 25^2 -29^2    ( by Pythagoras)

b^2 = (25+20)(25-20)

b^2 =  225

b = √225  = 15 m  answer