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Question

Puja decides to cut a circular disc into 4 equal parts. What is the perimeter of each part? (Given that the radius of the disc = 7cm, π = 227)



Your Answer
A

38 cm

Correct Answer
B

25 cm

Your Answer
C

35 cm

Your Answer
D

27 cm


Solution

The correct option is B

25 cm


When a circular disc is cut into four equal parts, the perimeter of each part is more than 2πr4. This is because the length of two radii are also added to the perimeter in each part.

Perimeter of each part = 2πr4+ r + r

 = πr2 + 2r

 = 22×77×2 + 2r

 = 11+2×7
                                    
 = 11 + 14

 = 25 cm

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