Answer:
=
= 64
= 225
= 289
Explanation:
Use the Pythagorean theorem to find the unknown side. The Pythagorean theorem states;

Where "a" and "b" are the legs, and "c" is the hypotenuse.
It is given that;
b = 15.
c = 17
a = x
+
=

+ 225 = 289
= 64
x = 8
To find the area of a square, one has to raise one of the sides to the power of two.
=
= 64
= 225
= 289