Question
A cone has a slant height of 20 cm and the radius of its
base is 15 cm. Find the volume of the coneSolution
First, find the height h using Pythagoras theorem: h = √(l² - r²) = √(20² - 15²) = √(400 - 225) = √175 = 5√7. Now, the volume V = (1/3)πr²h = (1/3)π(15²)(5√7) = (1/3)π(225)(5√7) = 375π√7 cm³. Correct answer : b) 992π cm³
Select the wrong term in the series.
10, 19, 23, 52, 61, 133, 149
5, 15, 30, 135, 405, 1215, 3645
3. 8, 15, 24, 34, 48, 63
In the following question, select the wrong number from the given alternatives.
48, 50, 52, 57, 59, 68, 75
Find the wrong number in the following number series:
2500, 1000, 400, 160, 60
Select the wrong term in the series.
44, 47, 41, 50, 38, 53, 40
Find the wrong number in the series given below.
5, 16, 50, 157, 463, 1394
8, 20, 48, 108, 232, 482
Identify the letter-cluster that does not belong to the following series.
RBK, TYM, VVO, XSP, ZPS, BMU
Select the number from among the given options that is wrong in the following series.
22, 30, 46, 78, 146, 270
