# Find the width of a rectangle with a perimeter of 90 cm and a length of 15 cm.

A rectangle is a four sided polygon with all congruent angles of 90º and pair of opposite sides equal.

## Answer: The width of the rectangle with a perimeter of 90 cm and a length of 15 cm is 30 cm.

Let's find the width of the rectangle.

**Explanation:**

Given perimeter (P) = 90 cm

Length ( l ) = 15 cm.

Let the width of the rectangle be w.

Formual to find perimeter of rectangle is 2 (l + w)

⇒ 90 cm = 2 (15 cm + w)

By dividing both the sides with 2, we get

⇒ (15 cm + w) = 45 cm

⇒ w = 45 cm - 15 cm

⇒ w = 30 cm

You can calculate online the perimeter of the rectangle using Cuemath's online perimeter of rectangle calculator.