Find the diameter of circle whose circumference is 22cm

 Solution:- Given circumference of a circle=22 cm

So, 2πr=22

⇒2×(22/7)×r=22

⇒2×22×r=22×7

⇒ r=22×7/(2×22) 

⇒r=7/2

Now daimeter of a circle=2r=2×(7/2) 

=7 cm