A circle has

One circle has a radius of r, and another circle has a radius of 2r. The area of the larger circle is how many times the area of the smaller circle?

The largest chord of the circle has a length of 20.4 cm. The radius of the circle will be _________.

One circle has a radius of 98 cm and a second concentric circle has a radius of 1 m 26 cm.How much longer is the circumference of the second circle than that of the first?

In each of the following state if the statement is true or false: Every circle has a centre.

State the following statement is true or false : Every circle has unique diameter.

In the diagram below,the outer circle has radius 3, and the inner circle has radius 2. The triangle is isosceles with the sides not touching the smaller cirale be equal.Then square of the area of darkened region is

State which of the following statements are true and which are false : Every circle has unique centre and it lies inside the circle.