Question

Find the circumference of the following.
A circle with radius 63 cm
b. A circle with diameter 8.4 m

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Answer 1

Circumference of circle = 2πR

A. Given, R = 63 cm

So, Circumference of circle $= 2 \times \frac{22}{7 } \times 63$

$= 18 \times 22 = 396 \: cm$

B. Given, Diameter = 8.4 m

Radius = D/2 = 8.4/2 = 4.2 m

So, Circumference of circle $= 2 \times \frac{22}{7} \times \frac{42}{10}$

$= \frac{6}{5} \times 22 = 26.4 \: m$

Answer 2

Given :

• → Radius of circle = 63 cm

Need to Find :

• → Circumference of circle

Formula Used Here :

• → Circumference of circle = 2πr

Putting value in formula :

→ Circumference of circle = 2πr

→ Circumference of circle = 2 × 22/7 × 63 cm

→ Circumference of circle = 2 × 22 × 9 cm

→ Circumference of circle = 396 cm

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b. A circle with diameter 8.4 m ?

Given :

• → Diameter of circle = 8.4 m
• → Radius of circle = 4.2 m

Need to Find :

• → Circumference of circle

Formula to Be Used :

• → circumference of circle = 2πr

Putting value in formula :

→ Circumference of circle = 2πr

→ Circumference of circle = 2 × 22/7 × 4.2 m

→ Circumference of circle = 2 × 22 × 0.6 m

→ Circumference of circle = 44 × 0.6 m

→ Circumference of circle = 26.4 m

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