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ICSE Class 10 Answered

ICSE Class 10 Selina solutions Cylinder Cone And Sphere-Ex20A26       In the above question, why only curved surface area of the cylinder has been calculated?  Why not the area of cross section of the other side of the cylinder?
Asked by nadiahussainkhan.0111 | 31 Jan, 2023, 18:09: PM
answered-by-expert Expert Answer
It appears that given solid is combination of cube and cylinder. Cylider is fixed on a surface of cube as shown in figure.
 
Side of cube equals to diameter of cylinder.
 
 
Let A1 be the surface area of top surface of cylinder ( see figure ).
 
Let A2 be remaining  area of top surface  of cube after fixing the cylinder on top of cube.
 
It is to be noted that , sum of A1 and A2 is surface area of face of cube.
 
Hence top surface area of cylinder is included in top surface area of cube .
 
Bottom surface area of cylinder coincide with top susrface area of cube.
 
Hence surface area of solid is surface area of 6 faces of cube and surface area of only curved surface of cylinder.
 
 
 
Answered by Thiyagarajan K | 31 Jan, 2023, 19:00: PM

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ICSE 10 - Maths
ICSE Class 10 Selina solutions Cylinder Cone And Sphere-Ex20A26       In the above question, why only curved surface area of the cylinder has been calculated?  Why not the area of cross section of the other side of the cylinder?
Asked by nadiahussainkhan.0111 | 31 Jan, 2023, 18:09: PM
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ICSE 10 - Maths
A wire of diameter 2mm is to be wound around a cylinder of 70mm diameter and 20cm height. If the wire is to be wound in such a manner that there is no gap between consecutive turns of the wire,what length of wire will be required for covering the entire cylinder?
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Asked by rajumuppidi828 | 29 Dec, 2021, 14:44: PM
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ICSE 10 - Maths
The radius of a roller is 35 cm and its length is 3 m. If it takes 30 revolutions to level a playground, find: a) the are of the playground b) the cost of levelling the ground at rs 5 per m2.
Asked by Vru23 | 03 Oct, 2020, 22:59: PM
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ICSE 10 - Maths
A cylindrical glass of 6 cm hright has a radius of 3.5 cm. find the wet surface areaof the glass when water is poured into it.
Asked by Vru23 | 03 Oct, 2020, 22:52: PM
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ICSE 10 - Maths
two right circular solid cylinder have radii in the ratio 3:5 and height in the ratio 2:3.find the ratio between their:curved surface area and volume
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Asked by k.8885666243 | 21 Aug, 2020, 06:54: AM
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ICSE 10 - Maths
a closed cylindrical tank made of thin iron sheet has diameter = 8.4 m and height = 5.4 m. how much metal sheet, to the nearest sq. m, is used in making this tank, if 1/15 of the sheet actually used was wasted in making the tank
Asked by Sayeeda | 17 Feb, 2018, 20:02: PM
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