Question

the area of a circle of radius r is 10 sq.cm. then the area of a circle of radius 2r is ________sq.cm

Answer 1

Answer:

Step-by-step explanation:

Area of circle =πr2

πr2=10....... Mark it as eqn 1

From eqn 1 value of r2 is 10/π...mark it as eqn 2

Now area of circle of radius 2r

π(2r) ^2 =π4r^2.... Mark it has eqn 3

Now put value of r^2 (eqn2) in eqn 3

π×4×10/π^2

Ans. 127.32

Now put value

Answer 2

Answer:

40 cm^2

Step-by-step explanation:

Explanation is given in the attached photograph.

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