Question

16. The diameter of a circle is 42 cm, find its perimeter. If the perimeter of the circle is

doubled, what will be the radius of the new circle.​

Answer 1

Step-by-step explanation:

HEY MATE,

STEP BY STEP

DIAMETER = 42 - RADIUS = 42/2 = 21CM.

SO, THE PERIMETER OF CIRCLE

= 2πR

= 2 X 22/7 X 21

= 132 CM.

NOW,

WHEN PERIMETER IS DOUBLE SO

= 132 X 2

= 264.

2πR = 264

2 X 22/7 X R = 264

R = 264 X 7/22 X 1/2

R = 42CM.

HENCE THE RADIUS WHEN WE DOUBLE THE PERIMETER = 42CM.

I HOPE THIS WILL HELP YOU...

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