Question
Find the area of a ring formed by two concentric circles
of radii 14 cm and 7 cm. Take pi = 22/7.Solution
ATQ, Area = pi(R2 - r2) = (22/7)*(142 - 72) 142 = 196, 72 = 49 Difference = 196 - 49 = 147 Area = (22/7)147 = 2221 = 462 cm2
The perimeter of a rectangle is 100% more than perimeter of a square of side 20 cm. If the length of rectangle is 200% more than side of square then fin...
If the length of a rectangle becomes double and its breadth becomes three-fourth, then find the percentage increase in its area.
Find total surface area of a cylinder of radius 7 cm and height 10 cm. (Ï€ = 22/7)
The area of a rhombus is given as 384 cm², and its perimeter measures 80 cm. Determine the total length of its two diagonals.
- 'A conference hall is floored with tiles measuring 1.2 meters by 80 cm. The hall has a length of 10.8 meters and a width of 4 meters. How many tiles are re...
The ratio of the radii of the bases of a cylinder and a cone is 2:3, while the ratio of their heights is 3:5. What is the ratio of the volume of the cyl...
If the two adjacent sides of a rectangle are x cm and x – 10 cm and its perimeter is 96 cm then find its area?
The length and breadth of a rectangle are increased by 30% and 40% respectively. The increase in the area of the resulting rectangle will be:
The perimeter of a floor a room is 36m. What is the area of four walls of the room, if its height is 6m?
A rectangular field is 45 m long and 30 m wide. A fence is to be put all around it. Find the area of the field and the length of the fence needed.
Relevant for Exams:
