What is the area of sector of a circle with central angle  $60\degree$  

Area of circle is 154cm², and Area of minor sector is 7.7cm², then calculate area of major sector of circle.

The radii of two concentric circle are 7cm and 14cm. What is the ratio of their areas?

Area of a sector with central angle  $\theta$  is

The area of the circle that can be inscribed in a square of side 6 cm is

The perimeter of square circumscribing circle of radius 'a' cm is

Angle of the sector is 90°then the ratio of Area of circle to area of sector is

A chord that passes through the center of the circle is called ________.