Question

7. Find the circumference of the following figures :
a) 14cm b) 7cm, 21cm​

Answer 1

Answer:

a) 44cm (if diameter)

   88cm (if radius)

b) 22cm (if diameter)

   44cm (if radius)

c) 66cm (if diameter)

   132cm (if radius)

Step-by-step explanation:

(I am explaining in two ways for each, as you have not mentioned whether the given numbers are radii or diameter.)

a) 14 cm

If diameter:

2πr = d × π

or 14 × 22/7

= 44 cm (Answer)

If radius:

2πr = 2 × 22/7 × 14

= 2 × 44

= 88 cm (Answer)

b) 7 cm

If diameter:

2πr = d × π

or 7 × 22/7

= 22 cm (Answer)

If radius:

2πr = 2 × 22/7 × 7

= 2 × 22

= 44 cm (Answer)

c) 21 cm

If diameter

2πr = d × π

or 21 × 22/7

= 66 cm (Answer)

If radius:

2πr = 2 × 22/7 × 21

= 2 × 66

= 132 cm (Answer)