Question

If the area of the circle is 9 pi sq meter. What is it's radius and circumference

Answer 1

Answer:

3 meters

Step-by-step explanation:

$area \: of \: circle = \pi {r}^{2} \\ 9\pi = \frac{22}{7} \times {r}^{2} \\ 9 \times \frac{22}{7} = \frac{22}{7} \times {r}^{2} \\ {r}^{2} = 9 \: {m}^{2} \\ r = \sqrt{9} \: m \\ r = 3 \: m$

Hence radius is 3 m.

Circumference= 2πr

= 2*(22/7)*3 m

= 6*(22/7) m

= 132/7 m

= 18.85 m

Answer 2

Given : Area of a circle is 9 π m²

To Find : circumference

Solution:

Area of circle = π ( Radius)²

Circumference of circle = 2π Radius

Area of circle  is given = 9 π m²

π ( Radius)² = 9 π m²

=> ( Radius)² = 9   m²

=> Radius = 3  m

Circumference of circle = 2π Radius

=> Circumference of circle = 2π * 3  m

=> Circumference of circle = 6π  m

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