Question
The ratio of the curved surface area to the total
surface area of a cone is 5:9. Determine the ratio of the radius of the cone to its slant height. (Use π = 22/7)Solution
Curved surface area of cone = πRL, where 'R' is radius and 'L' is slant height Total surface area of cone = πR(R + L) , where 'R' is radius and 'L' is slant height So, [πRL]:[πR(R + L) ] = 5:9 Or, L:(R + L) = 5:9 Or, 9L = 5R + 5L Or, 4L = 5R Or, R:L = 4:5
42Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 43Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 46Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ...
2187, 1458, 972, ?, 432, 288
362Â Â Â 284Â Â Â 393Â Â Â Â 451Â Â Â Â 144Â Â Â Â Â 221
...89Â Â Â Â Â 78Â Â Â Â Â 74Â Â Â Â Â 67Â Â Â Â Â 63Â Â Â Â ?
51Â Â Â 86Â Â Â 121Â Â Â 156Â Â Â 191Â Â Â ?
840 400 180 ? 15 -12.5
...5 4 29 24 185 ?
11Â Â Â 46Â Â Â 109Â Â Â 208Â Â Â Â 351Â Â Â Â ?
Identify the given logic and complete the series with the correct option. 12, 15, 18, 20,?
4, 17, 62, 317, ?, 13267
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