Question

find the circumference of the circle diamter is 21.7cm​

Answer 1

Answer:

diameter is 21.7cm

so radius = 21.7/2=10.85cm

so circumference will be

CIRCUMSTANCE OF A CIRCLE IS

2πr

where r is 10.85cm

2×π×10.85cm

we know that value of π is 22/7

so circumference will be

2×22/7×10.85=477.4/7= 68.2cm

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Answer 2

Given:-

Diameter of circle = 21.7 cm

To Find:-

Circumference of the Circle= ?

Formula to be used here:

$\sf \: (1) \: diameter \: of \: circle \: = \: 2 \times radius \\ \\ \sf \: (2)circumference \: of \: the \: circle \: = \: 2 \pi \: r$

Solution:-

Diameter of the Circle = 2 × radius

$\sf \implies \: 21.7 \: = \: 2 \times radius \\ \\ \sf \implies \: \frac{21.7}{2} \: = \: radius \\ \\ \sf \implies \: radius \: = \: 10.85$

Circumference of the circle = 2πr

$\sf \implies \: 2\pi \: r \\ \\ \sf \implies \: 2 \times \: \frac{22}{7} \times 10.85 \\ \\ \sf \implies \: 68.2cm$

Hence, Circumference of the Circle = 68.2 cm