The length of a rectangle, area of which is 105 cm2, is equal to the radius of a circle of area 1386 cm2. Find the perimeter of the rectangle?
Let the radius of the circle = r Area of circle = 1386 = 22/7 × r × r ⇒ r = 21 cm Area of rectangle = 105 = L × B = 28 × B ⇒ B = 5 cm Perimeter = 2 × (L + B) = 2 × (21 + 5) = 52 cm
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