Area and Volume of Geometric shapes and Surface area

A hemisphere dome of a building needs to be painted. If the circumference of the base of the dome is 17.6 m, then find the cost of painting it, given the cost of painting is ₹ 5 per 100 cm².

An item marked at ₹ 840 is sold for ₹ 714. What is the discount and discount %?

The area of a trapezium shaped field is 480 m², the distance between two parallel sides is 15 m and one of the parallel side is 20 m. Find the length of other parallel side.

The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in one hour ? (π = 3.14)

Three solid cubes of sides 30 cm, 40 cm and 50 cm respectively are melted and made one cube. Find the total surface area of new cube.

Write a short note on Mensuration.

Write a short note on Mensuration in 20 words.

A rectangular plot is of length 13.5 metre and breadth 2.5 metre. A rectangular tank (5 x 4.5 x 2.1 metre) is dug in it. The soil taken out from it is spread uniformly in the remaining part of the plot. Find increase in the height of the surface of plot.