Railways PYQCBT 1 2016

RRB NTPC · Question 51

A garden is built in the shape of a circle of 22 meters in diameter. There is a circular section of 4 m radius for the playground in the center of the garden. This circular ring made is said to be covered by grass. Find the area of this circular ring in square meters. A. 1470.8 B. 572.6 C. 330 D. 707.14

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (C) C

Explanation

Outer radius 11 m, inner radius 4 m. Ring area = π(11² − 4²) = 22/7 × 105 = 330 m².