Question

`\[\Boxed\]\ \space\ Hello mathematicians`

Find the perimeter and the area of a circle when radius is 10 cm.
Note:
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Answer 1

Formulas to remember:

• Circumference of circle = 2πr (r = radius)
• Area of circle = πr² (r = radius)

Finding the circumference of the circle:

• Circumference of circle = 2πr
• => Circumference of circle = 2 x 22/7 x 10
• => Circumference of circle = 44/7 x 10
• => Circumference of circle = 440/7 ≈ 62.86 cm

Finding the area of the circle:

• πr² = Area of circle
• => 22/7 x 10 x 10 = Area of circle
• => 22/7 x 100 = Area of circle
• => Area of circle = 2200/7 cm² ≈ 314.29 cm²

Answer 2

Explanation:

Using 3.14 as pi.

Perimeter of a circle = 2*pi*radius

= 2*3.14*10

= 62.8 cm

Area of a circle = pi*radius*radius

= 3.14*10*10

= 314 cm^2