Question

2.3. The radius of a circle is 21 cm. Find the radius of the circle whose area is double the area of the
area of circle of radius 21 cm.
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Answer 1

Answer:

THE ANSWER WILL BE 42..

Step-by-step explanation:

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Answer 2

Answer:

Radius of a circle, r = 21 cm

Perimeter of a quadrant,

P=( 2π+2)r units

=(7×222+2)×21=( 1422+2)×21

P=(1422+28 )×21= 14

50×21

=75cm.

Area of a quadrant, A= 4πr2

A= 722×21×21

=346.5cm

.

Step-by-step explanation:

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