Question

find the circumference of a circle of diameter 10 cm​

Answer 1

d = 10 then r = d / 2

Therefore , r = 10/2

r = 5

Circumference of circle = 2πr

= 2 × 3.14 × 5

= 10 × 3.14

= 31.4 units

Answer 2

GivEn:

• Diameter of the circle is 10cm.

To find:

• Circumference of the circle?

Solution:

☯ Let's consider radius be r.

★ According to the question:

Formula used,

• Radius = Diameter/2

Here,

• Diameter = 10cm

Therefore,

⠀⇒ 10/2

⇒ 5cm

∴ Hence, Radius of the circle is 5cm.

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Now, Finding Circumference of the circle,

★ Circumference = 2πr

⇒ 2 × 22/7 × 5

⇒ 44/7 × 5

⇒ 44 × 5/7

⇒ 220/7

⇒ 31.4cm

∴ Hence, Circumference of the circle is 31.4cm.

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More to know:

• Area of Circle = πr²

• Area of sector = θ/360 × πr²

• Length of an arc = θ/360 × 2πr