The perimeter of the rectangle is 64 cm, and one of its sides is 8 cm. Find the area of the rectangle.

Let’s recall the formula for finding the perimeter of a rectangle:
P = 2 (a + b)
and since one of the sides and the perimeter are given to us, we find the second side:
64 = 2 (a + 8)
2a + 16 = 64
2a = 64-16
2a = 48
a = 24
Now let’s remember the formula for finding the area of a rectangle:
S = ab
S = 24 * 8 = 192
Answer: 192