Question

circumference of a circle is 75 centimetre find out the cost of painting is 25 Paisa per centimetre ²

Answer 1

use formula of circumference to find radius,then find area and multiply with its cost

Answer 2

heya!!

As, we know,

Circumference of a circle = 2 π r
Therefore, 75 = 2 π r
Or, π r = 75 ÷ 2 = 37.5
Or, r = 37.5 ÷ π = 37.5 × (7/22) = 11.94 cm

Now area = πr²
Therefore, (22/7) × 11.94²
So, area = 447.88 cm²

Rate of painting = ₹0.25 per cm²
Total cost of painting = ₹ 111.97

Hope it helps!!