Question

find the circumference of a circle who's diameter is 3.5 cm?​

Answer 1

here
diameter of circle=d=2×r=3.5

then
circumference of circle
=pi×diameter
=22/7×3.5
=22/2
=11

Answer 2

Given = Diameter of circle = 3.5 cm

, Radius = 3. 5 /2

Circumference = 2πr

2×22/7×3.5/2 = 11 cm