Question

please help me to find out the answer.

Answer 1

We know, Circumference of a circle = 2rπ [ FORMULA ]

NOTE : Value of π = 22 / 7

In the question, Radius is given,

( i ) Radius = 28 cm

On applying formula, we get

Circumference = 2 × 28 × 22 / 7 cm

Circumference = 2 × 4 × 22 cm

Circumference = 176 cm

( ii )

Radius = 10. 5 cm

Applying formula,

Circumference = 2 × 10.5 × 22 / 7

Circumference = 2 × 105 × 22 / ( 7 10 )

Circumference = 44 × 105 / ( 7 10 )

Circumference = 66 cm

( iii )

Radius = 3.5 cm

Applying formula,

Circumference = 2 × 3.5 × 22 / 7

Circumference = 2 × 35 × 22 / ( 7 10 )

Circumference = 2 × 5 × 22 / ( 10 )

Circumference = 22 cm