Question

The diameter of the circle is 42cm find it perimeter if the perimeter of the circle is double what will be the radius of the new circle​

Answer 1

Answer:

diametre of the circle=42

so..radius=21cm

perimeter of a circle=2πr

so.. perimeter=2×22/7×21

=132 cm

perimeter=132 cm

radius=21cm

Answer 2

Answer:

The perimeter of the first circle is 132 cm and the radius of the new circle is 42 cm.

Step-by-step explanation:

1. diameter of the circle:- 42 cm

perimeter:- ?

formula:- πd ....(perimeter of circle)

so, (22÷7) × 42

= 6×22

=132 cm

2. if the perimeter is double = 2×132

=264 cm

to find the radius:- (formula) :- 2πr ....[perimeter of circle]

so, 264 = 2× (22÷7) × r

(264×7) ÷ (2×22) = r

r = 42 cm

Hope this will help you!!