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# Q.1 Find the circumference of the circles with the following radius. (Take $$\pi =\frac{22}{7}$$) (a) 14 cm (b) 28 mm (c) 21 cm

Circumference =$$2\pi r = 2 × \frac{22}{7} × 14 = 88 cm$$
Circumference =$$2\pi r = 2 × \frac{22}{7} × 28 = 176 mm$$
Circumference = $$2\pi r = 2 × \frac{22}{7} × 21 = 132 cm$$