The cost of paper is ₹55 per kilogram. If one kilogram of paper covers an area of 192 m2, then what will be the cost (in ₹) to cover a cube with an 8 metre edge?
₹110
Total surface area of a cube = 6a2.
Surface area = 6 × 82 = 6 × 64 = 384 m2
Paper required = 384 ÷ 192 = 2 kg
Cost = 2 × 55 = ₹110
Hence, ₹110.
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Important Questions from 3-D Mensuration
Find the total surface area of a closed cylinder having a base radius of 70 m and a height of 110 m. [Use π = \(22\over7\)]
- The curved surface area of a cylinder is half of its total surface area. If its height is 195 cm, then find its diameter (in cm).
The diameter of the base and slant height of a right circular cone are 30 cm and 113 cm, respectively. Find the volume (in cm³) of the given cone.
(Use $\pi = \frac{22}{7}$)- A cylindrical rod has an curved surface area of $4,900 \text{ cm}^2$. If the length of the rod is 97 cm, then the radius (in cm) of the rod, correct to two places of decimal, is:
Take $\pi = \frac{22}{7}$ - The volume (in $m^3$) of a cube, each of whose edges is 42 m, is:
