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If the rectangular faces of a brick have their diagonals in the ratio   then the ratio of the length of the shortest edge of the brick to that of its longest edge is
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
If the rectangular faces of a brick have their diagonals in the ratio ...
Assuming the dimensions of the brick are a, b and c and the diagonals are 3, 2
√3 and √15
Hence, a2 + b2 = 32 ...(1) 
b2 + c2 = (2√3)2 ...(2)
c2 + a2 = (√15)2 ...(3)
Adding the three equations,
2(a2 + b2 + c2) = 9 + 12 + 15 = 36 
⇒ a2 + b2 + c2 = 18....(4)
Subtracting (1) from (4), we get c2= 9 ⇒ c = 3
Subtracting (2) from (4), we get = 6 ⇒ a = √6
Subtracting (3) from (4), we get = 3 ⇒ b = √3
The ratio of the length of the shortest edge of the brick to that of its longest edge is = 
√3 / 3 = 1 : √3
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If the rectangular faces of a brick have their diagonals in the ratio then the ratio of the length of the shortest edge of the brick to that of its longest edge isa)b)c)d)Correct answer is option 'B'. Can you explain this answer?
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