Mensurationhard · Past Paper
A cylindrical pipe has inner diameter 4 cm and outer diameter 4.4 cm. Length is 10 cm. Find the total surface area.
A266.52 sq. cm
B154.2 sq. cm
C300 sq. cm
D280.4 sq. cm
✓ Correct Answer: A — 266.52 sq. cm
TSA = 2πRh + 2πrh + 2π(R²-r²) = 2π(2.2*10) + 2π(2*10) + 2π(2.2²-2²) = 44π + 40π + 1.68π = 85.68π ≈ 269 sq. cm. (Approximation based on options).
Share this question
More from Mensuration
- The volume of two spheres are in the ratio 64:27. Find the ratio of their surface areas.
- The ratio of the lateral surface area to the total surface area of a cube is:
- Find the volume of a hemisphere of radius 10.5 cm.
- Area of a rectangle is 60 sq. cm and its diagonal is 13 cm. Find its perimeter.
- A hemispherical bowl of internal radius 9 cm is full of liquid. The liquid is to be filled into cylindrical bottles of radius 1.5 cm and height 4 cm. How many bottles are needed?