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 square is inscribed in an equilateral triangle of side 12 cm. Find the area of the square.
- Find the volume of a sphere whose surface area is 154 cm^2.
- The area of a triangle with base b and height h is given by:
- The base of a triangle is 4 times its height. If area is 50 sq. cm, find height.
- The volume of a hemisphere is 2/3 π r^3. If r=1, the volume is: