Question
A conical cap has base diameter 126 cm and height 16 cm.
What is the cost of painting the surface of the cap at the rate of 20 paisa per cm² ? (Take π = 22/7.)Solution
Given: Diameter = 126 cm ⇒ Radius = 63 cm, Height = 16 cm, π = 22/7, painting rate = 20 paisa/cm². Slant height, l = √(632 + 162) = 65 cm Curved Surface Area (CSA) = πrl = (22/7) × 63 × 65 = 12884.29 sq.cm Cost = 12884.29 × 0.20 = 2576.86 paisa = ₹ 25.77
More Previous year papers Questions
- Find the wrong number in the given number series.
10, 19, 3, 28, 5, 54 42, 50, 59, 123, 148, 360
Find the wrong number in the given number series.
1900, 1171, 669, 316, 100, - 25
Find the wrong number in the given number series.
1024, 256, 64, 32, 4, 1- Find the wrong number in the given number series.
3, 6, 12, 24, 60, 96 Find the wrong number in given number series.
4350, 4400, 4600, 4750, 5150, 5450
- Find the wrong number in the given number series.
10, 13, 17, 24, 31, 41 Find the wrong number in the given number series,
31, 55, 91, 145, 217, 307
- Find the wrong number in the given number series.
5, 11, 21, 41, 65, 95 16, 16, 32, 128, 1024, 16384Â
Relevant for Exams:
