If the volume of a sphere is divided by its surface area, the result is 30 cm. The radius of the sphere is :
A90 cm
B9 cm
C81 cm
D8 cm
A90 cm
B9 cm
C81 cm
D8 cm
Related Questions:
The area of a rectangle is thrice that of a square. The length of the rectangle is 20 cm and the breadth of the rectangle is times that of the side of the square. The side of the square, (in cm) is