The length of a rectangle, area of which is 168 cm2, is equal to the radius of a circle of area 616 cm2. Find the perimeter of the rectangle?
Let the radius of the circle = r Area of circle = 616 = 22/7 × r × r ⇒ r = 14 cm Area of rectangle = 168 = L × B = 14 × B ⇒ B = 12 cm Perimeter = 2 × (L + B) = 2 × (14 + 12) = 52 cm
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