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