The perimeter of a circle is 44 cm. What is its radius?                                                                                             [Page No. 129]

Perimeter (circumference) = $2\pi r = 44$

$$44 = 2 \times \frac{22}{7} \times r$$

$$44 = \frac{44}{7} \times r$$

$$r = 44 \times \frac{7}{44}$$

$$r = 7 \text{ cm}$$