The area of a circle is 38.5 cm2. The circumference of the circle is
Let the radius if circle be r
Given, Area of circle = 38.5 cm2
Area of circle = πr2
⇒ πr2 = 38.5
Since π = 22/7
⇒ 22/7 × r2= 38.5
⇒ r2 = 38.5 × (7/22)
⇒ r2 = 12.25
⇒ r = √12.25 = 3.5 cm
∴ Radius of circle = 3.5 cm
Circumference of circle = 2πr
= 2 × 22/7 × 3.5 cm
= 22 cm
∴ Circumference of the circle is 22 cm
Let the radius if circle be r
Given, Area of circle = 38.5 cm2
Area of circle = πr2
πr2 = 38.5
Since = 22/7
∴ πr2 = 38.5
⇒ 22/7 × r2 = 38.5
⇒ r2 = 12.25
⇒ r = √12.25 = 3.50cm
∴ Radius of circle = 3.5 cm
Circumference of circle = 2πr
= 2 × 22/7 × 3.5
= 22 cm
∴ Circumference of the circle is 22 cm