Question
A right circular cone has a height of 24 cm and a base
radius of 9 cm. What is the total surface area of the cone, including the base?Solution
Slant height (l) of the cone = √(r² + h²) = √(9² + 24²) = √(81 + 576) = √657 ≈ 25.61 cm. Total surface area = πr(l + r), Total surface area = π × 9 × (25.61 + 9) = π × 9 × 34.61 = 311.49π ≈ 978 cm².
8      24       48      144      ?     864
...16, 54, 128, ‘?’, 432,686
25, 200, 40, ?, 64, 512
2120 1976 2097 1997 ? 2014
...32Â Â Â 96Â Â Â Â 240Â Â Â Â 480Â Â Â Â Â 720Â Â Â ?
10 59 ? 1169 3503 7001
...5Â Â Â Â Â Â Â Â Â 18Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 44Â Â Â Â Â Â Â Â Â Â Â 83Â Â Â Â Â Â Â Â Â 135Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 200Â Â Â Â ...
Select the number from among the given options that can replace the question mark (?) in the following series.
8, 27, 64, 125, 216, ?
75    196    52    221    ?    250
28 34 63 ? 769 3847
...
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