By increasing the radius of a sphere by 50 percent, how much will the area of its surface increase?

Find the area of the shaded region if the radius of each of the circle is 1 cm.

A solid metallic sphere of radius x cm is melted and then drawn into 126 cones each of radius 3.5 cm and height 3 cm. There is no wastage of material in this process. What is the value of x?

The diameter of a wheel is 14 cm. How many rotations will it take to cover a distance of 44 kilometres?

In the given figure, two squares shown in the figure have the arm of 12 cm and 8 cm. then find out the area of shaded part?

A field is in the form of an equilateral triangle of side 100 m. A horse is tied to a vertex of the field, with a 15 m long rope. Over what area can the horse graze? 

If a cube whose side is 7.5 cm, what will be its volume?

The ratio of the radii of two wheels is 3: 4, then the ratio of their circumferences will be.