Math, asked by amarsinghpawar1867, 3 days ago

7. Find the circumference of a circle whose area is 4 times the area of a circle with diameter 21 cm.

Answers

Answered by mokshahuja09

0

Answer:

131.95 cm

Step-by-step explanation:

Find radius of smaller cicle:

2r=d

r= 10.5 cm

area = πr^2

area =

110.25π

area 2=

4(110.25π)

there'fore radius of smaller circle=r

r= sqrt of 4*(110.25π)/π

r= 21 cm

therefore circumference= 2πr

=21π*2

131.95 cm

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