The perimeter of a parallelogram is 50

inches. If the length of one side is 15

inches, what is the length of a side adjacent to it?

Given:

Perimeter of parallelogram = 50 inches

Length of one side is 15 inches

Find the length of the adjacent side.

Parallelograms have 4 sides and its measures of opposite sides are equal.

Perimeter = 2a + 2b

where:

a are opposite sides of equal measure

b are opposite sides of equal measure

50 inches = 2 (15 inches)

50 inches = 30 inches + 2b

50 inches - 30 inches = 2b

20 inches = 2b

20 inches / 2 = b

10 inches = b

The length of the adjacent side is 10 inches.