Question

The diameter of a circular well is 4-2m.What is its circumference​

Answer 1

Given:-

• Diameter of a circular well is 4.2 m.

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To find:-

• Circumference of the circular well.

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Solution:-

If,

• Diameter = 4.2 m.

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Then,

• Radius = 4.2/2 = 2.1 m

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We know that,

Circumference of circle = 2πr

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Therefore,

→ Circumference of circle = 2 × 22/7 × 2.1

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→ Circumference of circle = 2 × 22 × 0.3

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→ Circumference of circle = 44 × 0.3

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→ Circumference of circle = 13.2 m

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Hence,

• the circumference of circle is 13.2 m.

Answer 2

Given:

• Diameter of circular well is 4.2 cm

Need to find:

• The circumference of the circle ?

Solution:

• Diameter of circle = 4.2 cm

Therefore,

• Radius of circle = 2.1 cn

As we know that?

⋆ Circumference = 2πr

Putting the values,

➜ Circumference = 2 × 22/7 × 2.1

➜ Circumference = 2 × 22 × 0.3

➜ Circumference = 13.2 cm

Therefore,

The circumference of the circle is 13.2 cm.

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