What is the radius of a circle with an area of `(pi)/(4)`?

A circle of radius 5 cm is drawn and another circle of 3 cm radius is cut out of this circle. What is the radius of a circle which has the same area as the area of the bigger circle excluding the cut one? (a) 2 cm (b) 3 cm (c) 4 cm (d) 4.5 cm

The radius of a circle is 4m . What is the radius of another circle whose area is 25 times that of the first ?

What is the radius of a circle whose circumference is pi ?

What is the radius of a circle whose area is equal to the sum of the area of two circles whose radii are 20 cm and 21 cm .

What is the area of circle with a circumference of 10pi ?

What is the area of the circle whose radius is the average of the radii of two circles with areas of 16pi and 100pi ?

What is the area of a circle with centre 0 ? I. The diameter of the circle is 4. II. The circumference of the circle is 4 pi .

The radius of a circle is 7. What is the area?

What is the area of the segment PQR, in the given figure, if the radius of the circle is 7 cm? (use pi = (22)/(7) )