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Friday, November 30, 2018

The area of circle is increased by 22 cm. its radius is increased by 1 cm. The original radius of the circle is

The area of circle is increased by 22 cm. its radius is increased by 1 cm. The original radius of the circle is
A6 cm
B3.2 cm
C3 cm
D3.5 cm

Answer is : c.) 3 cm

Explanation:

Let original radius be r.

Then, according to the question,
π(r+1)2πr2=22

π×[(r+1)2r2]=22

227×(r+1+r)(r+1r)=22

2r+1=72r=6

r=62=3 cm

Nithin K
answered Apr 7 '2018 at 16:39

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