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If half of the total surface area of a cuboid is equal to the square of its diagonal then prove that the cuboid is actually a cube.

If half of the total surface area of a cuboid is equal to the square of its diagonal then prove that the cuboid is actually a cube.

Grade:10

1 Answers

Arun
25757 Points
2 years ago
Dear student
 
Total surface area = 2 (lb+ bh+ hl)
Length of diagonal = √(l²+b²+h²)
 
Hence 2(lb +bh+ hl) = l² +b²+h²
 
Now so it will be
 
l = b = h
 
Hence it will be a cube

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