The area of a circle varies with the square of its radius. The area of a circle having radius 3 cm is ` C cm^(2)`. Find the area of the circle having redius 9 cm.

The area of a circle (A) varies directly as the square of its radius. The area of the circle of radius 7 cm is 154 cm^(2) . What is the area of the circle of radius 35 cm?

Find the area of the circle of radius 4.2cm.

The area of a circle of radius 7 cm is ________ cm^(2) .

Find the area of a circle with radius 3.5 cm.

Find the area of a circle of radius 35 cm.

Find the area of a circle of radius 4.2 cm