Question
A hollow cylinder is made up of steel. the difference in
its outer and inner curved surface area is 132cm2.Height of cylinder is 21 cm and sum of the inner and outer radius is also 21 cm. Find the approximate Total surface of the hollow cylinder (in cm 2 )Solution
ATQ,
Given: Difference in curved surface area = 132 cm2 Height h =21cm Find the difference between the outer and inner radii. 
Solve the system of equations: 
Calculate the total surface area:
So, the total surface area is approximately 3466.9 cm².
Find the circumference and area of a circle of radius 7 cm. Take π = 22/7.
The base of the triangular area is two times its height. If the cost of farming area is Rs. 2000 and Rs. 80 per hectare. Find its base (1 hectare = ...
The breadth of a rectangle is increased by 9 cm, it will become twice the length of the rectangle. If the new perimeter is 294 cm, then find the origina...
Two wires A and B are made of the same material and have the same length but different cross-sectional areas. If the resistance of wire A is 9 times the...
The cost of fencing a rectangular field at the rate of Rs. 5/metre is Rs. 350. If the length of the field is 11 metres more than its breadth, then find ...
In a rectangular floor of length and breadth of 19 metres and 6 metres, respectively, square tiles each of 2 metre edge length are to be laid. If the co...
The perimeter of an equilateral triangle is 36√3 cm. Find its height.
The volume of a cuboid is 480 cubic cm. If its length is 10 cm and breadth is 8 cm, find its height.
Find the length of a wire radius 0.40 cm which can completely cover the surface of a cylinder whose height is 1.6m and base radius 21 cm?
A wire, when bent in the form of a square encloses an area of 121 sq. cm. If the same wire is bent in the form of a circle, what is the area enclosed by...
Relevant for Exams:
