Find the length of the diameter of a circle whose circumference is 44 cm.

Let radius = r cm.

By formula,

Circumference = 2πr

2πr = 44

$\Rightarrow 2 \times \dfrac{22}{7} \times r = 44 \\[1em] \Rightarrow \dfrac{44r}{7} = 44 \\[1em] \Rightarrow r = \dfrac{44 \times 7}{44} \\[1em] \Rightarrow r = 7 \text{ cm}.$

Diameter = 2r = 2 × 7 = 14 cm.

Hence, length of the diameter of the circle = 14 cm.