Question
Find the curved surface area of a right circular cone
with a radius of 40 cm. The height of the cone is one-third of the length of a rectangle. The rectangle has a perimeter of 96 cm and a breadth of 21 cm. Round off the final answer to the nearest integer, using π = 22/7.Solution
Length of rectangle = (96/2) - 21 = 48 - 21 = 27 cm
Height of cone = (1/3) X 27 = 9 cm
Now, slant height of cone = √(height 2 + radius 2 ) = √(9 2 + 40 2 )
= √(81 + 1600) = √1681 = 41 cm
Curved surface area of cone = π X radius X slant height
= (22/7) X 40 X 41 ~ 5,154 cm 2
More Arithmetic Progression Questions
7, 8, 18, 57, 232, ?
16, 20, 11, 27, ?, 38
4, 4, 12, 60, ?, 3780
What will come in place of the question mark (?) in the following series?
110, 120, ?, 146, 162, 180
216, 81, 297, 378, ?, 1035, 1728
23Â Â Â Â 44Â Â Â Â 64Â Â Â Â 83Â Â Â Â Â ? Â Â Â Â Â 118
...- What will come in place of (?) in the given number series.
2, 6, 18, 54, ?, 486 140, 146, 158, 176, ?, 230
18, 22, 28, 38, 54, ?,
5Â Â Â Â 12Â Â Â Â 26Â Â Â Â 47Â Â Â Â Â ? Â Â Â Â Â Â 110
...
Relevant for Exams:
