Question

1 ) Find the circumference of circle take pie 3.142 diameter 300mm.

2 ) find the circumference of circle take pie 3.142 radius 25cm.

Answer 1

Heya!!!

Circumference of circle having radius r is =

2 π r

radius of circle having diameter D and radius r = D / 2

1)

2 π ( 150 ) = 2 × 3.142 × 150 = 942.6mm

2)

2 × 12.5 × 3.142 = 78.55cm


Another method.

Circumference of circle having diameter D =

π × D


Have a nice time.

Answer 2

1. given :-

diameter = 300mm = 30cm

circumference of the circle = πd

= 3.142 × 30

= 94.26cm

2. given :-

diameter = 25cm

circumference of the circle = πd

= 3.142 × 25

= 78.55cm

u can use 2πr formula but first find it's radius by dividing diameter by 2.