CBSE Class 10 Answered
A container is in the form of a frustum of a cone of height 30 cm with radii of its lower and upper ends as 10 cm and 20 cm respectively.Find the capacity and surface area of the container. Also, find the cost of the milk which can completely fill the container, at the rate of Rs 25 per litre (use = 3.14).
Asked by Topperlearning User | 21 Feb, 2014, 09:46: AM
Expert Answer
Capacity (or volume) of the container = [r21 + r22 + r1r2]
Here, h = 30 cm, r1 = 20 cm and r2 = 10 cm
So, the capacity of container = 3.14 x[202 + 102 + 20 x 10] cm3
= 21.980 liters
Cost of 1 litre of milk = Rs. 25
Cost of 21.980 litres of milk = Rs. 21.980 x 25 = Rs. 549.50
Surface area of the bucket = curved surface area of the bucket + surface area of the bottom
= l(r1 + r2) +r22
Now, l=
l =cm = 31.62 cm
Therefore, surface area of the bucket
= 3.14 x 31.62 (20 + 10) + 3.14 x (10)2
= 3.14 x 1048.6 cm2 = 3292.6 cm2 (approx.)
Answered by | 21 Feb, 2014, 11:46: AM
Application Videos
Concept Videos
CBSE 10 - Maths
Asked by kavya123 | 01 Jun, 2021, 09:38: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by thunderboyshubharth2005 | 13 Mar, 2021, 01:54: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by bhumichoudhary9091 | 15 Nov, 2020, 02:56: AM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by nsiddu2007 | 30 Sep, 2020, 11:04: AM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by adalroshan2464 | 10 Mar, 2020, 10:47: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by aadhyavig15 | 27 Jan, 2020, 12:39: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by ponnunnimelillam | 12 Jan, 2020, 07:41: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by Topperlearning User | 27 Jul, 2017, 03:16: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by Topperlearning User | 27 Jul, 2017, 03:16: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by Topperlearning User | 27 Jul, 2017, 03:16: PM
ANSWERED BY EXPERT