Question

The circumference of a circle is 31.4 cm . Find the radius and the area of the circle ? ( take π = 3.14​

Answer 1

Answer:

circumference = 31.4 cm

• 2πr = 31.4

• r = 31.4*7/22*1/2 = 49.32cm

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Answer 2

Circumference of the circle = 31.4 cm

→ 2πr = 31.4 cm

→ 2 × 3.14 × r = 31.4 cm

→ r = (31.4)/(2×3.14)

→ r = 10 × 2

→ r = 20cm ans.

So, Radius of the circle is 20cm.

Now,

Area of the circle = πr²

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 3.14 × (20)²

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 3.14 × 400

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 1256 cm² ans.

So, Area of the circle is 1256 cm² ans.