Question

Find circumference radius is 2.1

Answer 1

Answer:

circumference of circle = 2πr, where r is radius = 2.1

circumference = 2 × π × 2.1 = 2 × 22/7 × 2.1 = 13.5 cm

Answer 2

r = 2.1

$circumference \: = 2\pi \: r \\ \\ = 2 \times \frac{22}{7} \times 2.1 \\ \\ = 2 \times 22 \times 0.3 \\ \\ = 44 \times 0.3 \\ \\ = 13.2 \: unit$

So circumference= 13.2 unit.