Question

find the circus defence of each circle having dia meter of 21 cm
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Answer 1

Answer:

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Given that

Diameter of a circle = 21 CM

Circumference of a circle = ?

Solution

Radius = Diameter/2

= 21/2 CM

= 10.5 CM

Circumference of a circle = 2πr

= 2 × 22/7 × 10.5 CM

= 66 CM

Step-by-step explanation:

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Answer 2

Answer:

Circumference = 2πr

Given, d = 21 cm ⇒ r = 21/5

$\implies Circumference = 2 \times \frac{22}{7} \times \frac{21}{5} = \boxed {\bold{26.4 cm}}$