Radius of a circle is doubled. What will be the ratio of areas of the new circle to the area of the given circle?
Area of a circle is proportional to the square of the radius hence if the radius is doubled, area becomes 4 times.
The surface area of a sphere is 2464 cm2. If its radius be doubled, what will be the surface area of the new sphere?
Radius of a circle is doubled. What will be the ratio between the area of the new circle and the area of the original circle?