Question

3. Find the circumferences of the circles whose diameters are
(a) 9 cm
​

Answer 1

Step-by-step explanation:

CIRCUMFERENCE = 2πr

where, d= 9

so, r = 9/2

Now , circumference =

$2 \times \pi \frac{9}{2}$

$9\pi$

$9 \times \frac{22}{7}$

$\frac{198}{7}$

$28.2 \: {cm}^{2}$

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