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Three Equal cubes are placed adjacently …

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Three Equal cubes are placed adjacently in a row. Find the ratio of total surface area(TSA) of the new cuboid to that of the sum of the surface area(SA)of all small cubes.

Posted by Sanidhya Soni 8 years, 3 months ago

CBSE > Class 09 > Mathematics

2 answers

Jessica Sharma 8 years, 3 months ago

TSA of cube = 6a square . TSA of 3 cubes = 6a square x 3 = 18 a square Now Length of the cuboid so formed is = 3a square breadth= a Height = a So , TSA Of cuboid is = 2(lb+bh + hl) Now putting the values of l , b and h =2( 3a x a + a x a + a x 3a ) =2(3a square + a square + 3a square ) =2 ( 7 a square ) =14 a square Now ratio of TSA Of cuboid to TSA Of 3 cubes 14a square : 18 a square = 7: 9

0Thank You

Jessica Sharma 8 years, 3 months ago

7:9

4Thank You

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CBSE > Class 09 > Mathematics