Mensurationhard · Past Paper
A room's dimensions are 5m x 4m x 3m. It has one door of 2m x 1m and two windows of 1m x 1m each. Find the area of the walls to be painted.
A54 m²
B50 m²
C48 m²
D46 m²
✓ Correct Answer: B — 50 m²
Area of 4 walls = 2 * 3 * (5 + 4) = 6 * 9 = 54 m². Area of openings = (2*1) + 2*(1*1) = 2 + 2 = 4 m². Net area = 54 - 4 = 50 m².
Share this question
More from Mensuration
- The radii of the ends of a frustum of a cone are 14 cm and 7 cm, and its height is 6 cm. Find its volume.
- The lateral surface area of a square pyramid is given by the formula (where 'a' is base side and 'l' is slant height):
- Find the volume of a cone if its base diameter is 10 cm and height is 12 cm.
- A cylinder has a radius of 10 cm and height of 20 cm. If the height is doubled and radius is halved, the new CSA will be:
- Find the area of 4 walls of a room if the perimeter of the floor is 30 m and height is 3 m.