Question

2. 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

We know,

Circumference of circle = 2πr

Where,

• r is radius of circle.
• π is 22/7 or 3.14.

a. A circle with radius 63 cm.

r = 63 cm

Put r in circumference formula

$\longrightarrow$ 2 × 22/7 × 63

$\longrightarrow$ 44/7 × 63

$\longrightarrow$ 2772/7

$\longrightarrow$ 396

Therefore,

Circumference of circle is 396 cm.

b. A circle with diameter 8.4 m.

r = Diameter/2

= 8.4/2

= 4.2

Radius (or r) of circle is 4.2 m

Now, Put r in circumference formula :

$\longrightarrow$ 2 × 22/7 × 4.2

$\longrightarrow$ 44/7 × 4.2

$\longrightarrow$ 184.8/7

$\longrightarrow$ 26.4

Therefore,

Circumference of circle is 26.4 m.

Answer 2

Answer:

A. Circumference of the circle= 2^r

Radius=63cm

=2×22/7×63cm

=396cm

B. Diameter=8.4m

Radius=8.4/2m

=4.2 m

Then,

circumference of the circle =2^r

= 2×22/7×4.2m

= 26.4 m

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