What is the missing side length?
(Use Pythagorean Theorem)

20 units

Step-by-step explanation:

The Pythagorean Theorem states that:

Now we can insert values into the equation.

Now we can plug these ☝ values into the Pythagorean Theorem:

After we solve for we get:

b = 20

Step-by-step explanation:

15 + b = 25

(you have to square each one)

15 x 15 = 225

b x b = b

25 x 25 = 625

625 - 225 = 400

= 20

hope this helps