question_answer

DIRECTIONS: Passage ? 1 Read the passage(s) given below and answer the questions that follow Area between two concentric circles. Two circles are said to be concentric if they have a common center. Sometimes, we have to find the area between two concentric circles. For example, the area of a ring, the area of a circular field having a circular pond in the middle. So, let us consider two concentric circles with r as the radius of the inner circle and R as the radius of the outer circle. Area between the circles \[=\] Area of outer circle\[-\]Area of the inner circle \[=\pi {{R}^{2}}-\pi {{r}^{2}}=\pi ({{R}^{2}}-{{r}^{2}})\] A circular pond has a 50 cm wide footpath along the edge. A man walks around the outer edge of the footpath with 66 cm long steps. In 200 steps, he makes a full round. The radius of the pond is

A) 20 m                           

B) 50 m

C) 20 cm                         

D) 20.50 m