Question

find the circumference of circles with the following diameter a)630mm​

Answer 1

Step-by-step explanation:

✨given :

d = 630 mm

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radius =630÷2

☞315mm

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circumference of circle ⭕= 2πr

= 2×22÷7×315 (π = 22÷7)

= 1980mm

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Answer 2

Answer:

Given diameter,d=630mm

d= 630/10=63cm and d= 2r

r=63/2

Circumference of circle= 2πr

=2×22/7×63/2

2 is multiplied and 2 is divided, that is nullified means got cut

=22/7×63

7 divides 63 and gives 9

=22×9

=198cm²