The area of a circle is increased by 22 cm2 when its radius is increased by 1 cm. The original radius of the circle is
The circumference of a circle is 11 cm and the angle of a sector of the circle is 60°. The area of the sector is
The area of a sector of a circle is 616 cm2 with a central angle of 10°. The radius of the circle is ______. (use π = )
As shown in the given figure, inside the large semicircle, two semicircles (with equal radii) are drawn so that their diameters all sit on the large semicircle's diameter. What is the ratio between the red and blue areas?
The height of a trapezium is 68 cm, and the sum of its parallel sides is 75 cm. If the area of the trapezium is times of the area of a square, then the length of the diagonal of the square is: (Take )
One side of a rhombus is 13 cm and one of its diagonals is 24 cm. What is the area (in cm2) of rhombus ?