Question

find the diameter of a circle when the circumference is 22cm.

Answer 1

Circumference

$circumference \: of \: circle = 2\pi \: r \: or \: \pi \: d$

22 = 2×22/7×r

2×22/7×

Answer 2

given circumference of a circle is 22 then

we have circumference of circle is πd

πd=22

(22÷7)×d=22 (because π=(22÷7))

d÷7 = 22÷22

d÷7=1

d=7cm