Question

A solid consisting of a right circular cone of height 120 cm and radius 60 cm standing on a hemisphere
of radius 60 cm is placed upright in a right circular cylinder full of water such that it touches the bottom. How many
litres of water is left in the cylinder, if the radius of the cylinder is 60 cm and its height is 180 cm. (Use = )
OR
The cost of fencing a circular field at the rate of * 24 per m is 5280. The field is to be ploughed at the rate of
0.50 per m². Find the cost of ploughing the field. (Use at = )​

Answer 1

Answer:

1108800

Step-by-step explanation:

Cost of fencing = area of field × rate per m

= 5280

2× 22/7 × r = 5280

r = 5280 × 7 / 22 × 2

r = 36960 / 44

r = 840

cost of ploughing the field = area of field × cost per m^2

rs = 1108800