Area of a circle of radius s is _______ ,

Area of a circle of radius P is ___________ .

The area of a circle whose radius is 6cm, is trisected by two concentric circles.Find the radius of the smallest circle.

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the radius of these two circles.

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?

The radius of two circles are in the ratio 3 : 4 and sum of their areas is equal to the area of a circle whose radius is 35 cm. Find the ratio of the areas.

The area of circle whose radius is 6 cm is trisected by two concentric circles. The radius of the smallest circle is

What is ratio of perimeter of circle and area of circle if radius is 7 cm.

Prove that (1) the area of a sector of circle with radius r and central angle theta^(@) is (1)/(2)r^(2)theta (ii) the area of a sector of a circle of radius r and an arc of length s is (1)/(2)rs