Find the ratio of area of two circles whose radius is 7cm and 14 cm ​

Find the circumference of the circle whose radius is 7 cm.

Find the area of a circle whose radius is 7cm (ii) 2.1m7km

The area of a circle, whose radius is 14 cm, is :

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 .

Find the radius of a circle having area equal to the sum of the areas of two circles with radius 20 cm and 15 cm respectively.

Find the area of the sector of a circle whose radius is 14cm and angle of sector is 450.

Area of a circle is the sum of the area of those two circles,whose radius are 5cm and 7cm, respectively.

Find the diameter of the circle whose area is equal to the sum of the areas of two circles having radii 4 cm and 3 cm.

The area of a circle whose radius is 10 cm is _____.