Mensurationmedium · Past Paper
Find the total surface area of a cone whose radius is r/2 and slant height is 2l.
Aπr(l + r/4)
Bπr(l + r/2)
C2πrl
Dπrl + πr²
✓ Correct Answer: A — πr(l + r/4)
TSA = π(r/2)(2l + r/2) = π(r/2)(2l) + π(r/2)(r/2) = πrl + πr²/4 = πr(l + r/4).
Share this question
More from Mensuration
- A cuboid of volume 96 cm³ has a length of 8 cm and a breadth of 3 cm. Find its height.
- A wire is in the shape of a circle of radius 7 cm. If it is bent into a square, what is the area of the square?
- Find the total surface area of a cube whose side length is 5 cm.
- Area of four walls of a room with length 5m, breadth 4m, and height 3m is:
- Find the curved surface area of a cylinder whose circumference of the base is 44 cm and height is 12 cm.