SSC CHSL Model Paper 20

Question : 65 of 100

Marks: +1, -0

If the area of a circle is increased by 22 cm, its radius increases by 1 cm. The original radius of the circle is -

Solution:

Explanation: Let the original radius be r cm

π (r + 1)^2 - π r^2 = 22

(2r+1)×22/7=22

2r+1=7

r=3\cm

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