Question
How do you calculate the lateral surface area of a right
circular cone if its diameter is 12 cm and its height is 8 cm?Solution
Radius of the cone = (12/2) = 6 cm So, slant height of the cone = √(82 + 62) = 10 cm So lateral surface area of the cone = π x radius x slant height = 60π cm2 Hence, option c.
18Â Â Â Â Â Â Â Â Â Â Â Â 29 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 51 Â Â Â Â Â Â Â Â 84 Â Â Â Â Â Â Â Â 128 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 182
If 4 10 16 26 x 50
Then find the value of (x² - 1) + ( x² + 1).
...4, 8, 24, ?, 840, 9240
32, 65 , 196, 785, ? , 23557
16 18 14 20 12 ?
...362Â Â Â 284Â Â Â 393Â Â Â Â 451Â Â Â Â 144Â Â Â Â Â 221
...24  12  18  ?  157.5  708.75  3,898.125
Choose the number which is different from others in the group.
21 11.5 13 ? 45.5 116.75
...31   48    67    90   ?      150
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