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CBSE Class 8 Answered

what will be it's cost to paint the circular roof of a building of radius 4.2 m at the rate of Rs. 25squar meter?
Asked by kumudinigajbhiye159 | 19 Aug, 2023, 07:01: PM
answered-by-expert Expert Answer
Radius space of space circular space roof space equals space 4.2 space straight m Area space of space circular space roof equals straight pi left parenthesis radius right parenthesis squared equals 22 over 7 cross times 4.2 cross times 4.2 equals 22 over 7 cross times 42 over 10 cross times 42 over 10 equals 5544 over 100 straight m squared Cost space of space painting space of space per space straight m squared equals Rs.25 rightwards double arrow Cost space of space painting space 5544 over 100 straight m squared equals Rs.25 cross times 5544 over 100 equals 5544 over 4 equals Rs.1386
Answered by Rashmi Khot | 21 Aug, 2023, 10:02: AM

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CBSE 8 - Maths
what will be it's cost to paint the circular roof of a building of radius 4.2 m at the rate of Rs. 25squar meter?
Asked by kumudinigajbhiye159 | 19 Aug, 2023, 07:01: PM
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CBSE 8 - Maths
The ratio of the radii of two cylinders is 1:2, and the ratio of their heights is 2:3, find the ratio of the volumes of the two cylinders.
Asked by fifas183 | 19 Feb, 2022, 06:43: PM
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CBSE 8 - Maths
what is the formula of lateral surface area of cylinder
Asked by anchalagarg91 | 07 Feb, 2020, 12:10: PM
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CBSE 8 - Maths
sphere is converted into a cylindrical wire of length 32 metre. The diameter of sphere is 20 times of the diameter of the cylindrical wire. What is the radius of sphere?
Asked by cdivya753 | 02 Dec, 2019, 08:12: PM
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CBSE 8 - Maths
Find the total surface area of a cylinder whose radius of the base =7cm and height=20cm
Asked by pandeydivyank | 25 Feb, 2019, 04:44: PM
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CBSE 8 - Maths
A metallic pipe is 0.7 cm thick. Inner radius id 3.5 cm and length is 5 dm. Find its total surface area.  
Asked by preetiwalia800 | 19 Feb, 2019, 11:20: AM
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CBSE 8 - Maths
A silver paper covers a packet of 10 choclates Coin of radiud 2cm and 7mm thickness.  How much paper need to cover 1000 such packets. 
Asked by Nimmi | 04 Feb, 2019, 12:59: PM
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CBSE 8 - Maths
The wall of length 10 m. was to built across an open ground .the height of wall is 4m. And thickness is 24 cm . If this wall is to built uo with bricks whose dimension are 24cm×12cm×8cm, how many bricks would be required ?        Ans - 4167 
Asked by Mohdayaz9921 | 02 Feb, 2019, 08:27: PM
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CBSE 8 - Maths
Find the radius of the base of a cylinder whose volume and height are 1.54 cm3 and 1 m respectively.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 8 - Maths
A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the platform.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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