Question

Note: take a =
in the above two questions.
Taking n=3.14, find the circumference of a circle whose radius is
(a) 8 cm (b) 15 cm (c)20 cm
2.Calculate the radius of a circle whose circumference is 44cm?​

Answer 1

Answer:

1 ) .given that =π = 3.14 circumference of circle formula is 2πr ,r = 8

2πr = 2*3.14*8= 50.24

2). give that -

π = 3.14 , r=15

=2 π r= 2*3.14*15= 94.2

3). π =3.14,r= 20

=2πr=2*3.14*20= 125.6

Answer 2

As we know that,

Circumference of a circle =2πr

Whereas, r is the radius of circle.

Given:-

Radius of circle = 8cm

Therefore,

Circumference of circle =2×3.14×8 = 50.24cm

Radius of second circle = 15cm

Therefore,

Circumference of circle = 2×3.14×15 = 94.2cm

Radius of third circle = 20cm

Therefore,

Circumference of circle = 2×3.14×20 = 125.6cm

circumference of a circle = 44cm

radius =

$2\pi r = 44cm \\ \\ = 2 \times \frac{22}{7} \times r = 44cm \\ \\ r = 7 \times \frac{44}{22} \times 2 \\ \\ = 7 \times \frac{2}{2} \\ \\ = 7 \times \frac{1}{1} = 7$

so the radius of 44 circumference = 7

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