Question

if the area of the circle is increased by 21% then what is the percentage increase in the circumference of the circle?

Answer 1

Step-by-step explanation:

If the circumference increases by 21%, the radius also increases by 21%.

The area is proportional to the radius squared, so the increased area is

1.21 r * 1.21r * PI = 1.46 PI r^2

The new area is 1.46 times the original area

So the area increases by 46%