# Find the circumference of the circles with the following radius: (Take π =22/7)

(a) 14 cm (b) 28 mm (c) 21 cm

**Solution:**

(a) Circumference of the circle = 2πr

= 2 × 22/7 × 14 cm

= 2 × 22 × 2 cm

= 88 cm

(b) Circumference of the circle = 2πr

= 2 × 22/7 × 28 mm

= 2 × 22 × 4 mm

= 176 mm

(c) Circumference of the circle = 2πr

= 2 × 22/7 × 21 cm

= 2 × 22 × 3 cm

= 132 cm

**Video Solution:**

## Find the circumference of the circles with the following radius: (Take π = 22/7)

(a) 14 cm (b) 28 mm (c) 21 cm

### Class 7 Maths NCERT Solutions - Chapter 11 Exercise 11.3 Question 1

**Summary:**

The circumference of the circles with the following radius is (a) The radius is 14 cm and circumference is 88 cm (b) The radius is 28 mm and circumference is 176 mm (c) The radius is 21 cm and circumference is 132 cm