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 equal opposite sides and all angles equal to 90º.
Answer: The width of the rectangle 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 the perimeter of rectangle is 2 (l + w)
⇒ 90 = 2 (15 + w)
By dividing both the sides with 2, we get
⇒ (15 + w) = 45
⇒ w = 45 - 15
⇒ w = 30 cm