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CBSE Class 9 Answered

if v is the volume of a cuboid of dimensions l b and h and s is the surface area. Prove that 1/v = 2/s (1/l + 1/b +1/h)
Asked by Solar | 05 Jan, 2018, 04:24: PM
answered-by-expert Expert Answer
begin mathsize 16px style Here comma Length equals straight l Breadth equals straight b Height equals straight h Volume equals straight v equals straight l cross times straight b cross times straight h SA equals straight S equals 2 left parenthesis lb plus bh plus lh right parenthesis Now comma 2 over straight S open square brackets 1 over straight l plus 1 over straight b plus 1 over straight h close square brackets equals fraction numerator 2 over denominator 2 left parenthesis lb plus bh plus lh right parenthesis end fraction open square brackets fraction numerator open parentheses bh plus lh plus lb close parentheses over denominator lbh end fraction close square brackets space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 1 over lbh space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 1 over straight v end style
Answered by Rashmi Khot | 05 Jan, 2018, 05:09: PM

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CBSE 9 - Maths
can you help me to answer 5question.
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Asked by swatipuspapatel | 11 Oct, 2020, 10:52: AM
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CBSE 9 - Maths
 The area of four walls of a room of height 5 m is 144 m2. If the total surface area of the room is 244 m2 then its length is
Asked by arajeevshashank | 29 Nov, 2019, 06:35: PM
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CBSE 9 - Maths
The surface area of a cuboid is 3328 m2. If its dimensions are in the ratio 4:3:2. Find the volume of cuboid.
Asked by Ravindar | 18 Jun, 2019, 06:44: PM
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CBSE 9 - Maths
Three cubes of metal whose edges are 2 cm, 3 cm and 4 cm are melted and a new cube is made. Find the volume of the new cube.
Asked by Topperlearning User | 23 Aug, 2017, 03:08: PM
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CBSE 9 - Maths
How many cubes of edge 1 cm can be made out of a cube having an edge of length 4 cm?
Asked by Topperlearning User | 23 Aug, 2017, 03:07: PM
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CBSE 9 - Maths
Find the volume of a cube whose total surface area is 1014 m2.
Asked by Topperlearning User | 23 Aug, 2017, 02:42: PM
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CBSE 9 - Maths
Find the height of the cuboidal tank with square base of area 169 m2, if it can hold 253500 litres of water.
Asked by Topperlearning User | 23 Aug, 2017, 02:41: PM
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CBSE 9 - Maths
How many bricks having dimensions 20 cm × 5 cm × 5 cm are required to make a wall 2.5 m long, 0.5 m broad and 5 m in height?        
Asked by Topperlearning User | 23 Aug, 2017, 03:06: PM
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CBSE 9 - Maths
A village has a tank measuring 15 m × 10 m × 5 m. For how many days will the water will last if there is a population of 2500 and each person requires 100 litres of water per day?
Asked by Topperlearning User | 23 Aug, 2017, 03:06: PM
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CBSE 9 - Maths
Find the cost of digging a cuboidal pit 6.5 m long, 5 m broad and 4 m deep at the rate of Rs. 20 per m3.
Asked by Topperlearning User | 23 Aug, 2017, 03:06: PM
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