Question

The length of a rectangle is three-fifth of the radius of a circle. The radius of the circle is equal to the side of a square, whose area is 6400 m2. The perimeter (in m) of the rectangle, if the breadth is 15 m, is:

• A. 160
• B. 120
• C. 126
• D. 180

Answer 1

Answer:

C. 126

Area of square = (Side)² = 6400

Side² = 6400

Side = √6400 = 80

Radius of cirlce = Side of square = 80 m

Length of rectangle = 3/5 × 80 = 48 m

Perimeter of the rectangle = 2(Length + Breadth) = 2(48 + 15) = 126