Question

and decreasing in the radius of a circle by 30% its area is decreased by​

Answer 1

Answer:

Area is decreased by 51 %

Step-by-step explanation:

Radius is decreased by 30%

Let original radius be r

Original area = πr²

Radius after decrement = r(1-30/100) =7r/10

Thus new area = π (7r/10)² = 0.49πr²

Therefore decrement in area = πr²- 0.49πr² =0.51πr²

Percentage change = 51%