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cube

by pappueshwar » Mon Mar 12, 2012 8:52 am
What is the angle formed by the diagonals of two adjacent surfaces of a cube?

A) 45
B) 60
C) 90
D) 30
E) None of these
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by Neo Anderson » Mon Mar 12, 2012 9:12 am
B)60;
as the triangle formed by all the diagonals (as shown in your figure) will be an equilateral triangle with length of side as the length of the diagonal of respective face, as it is a cube, all lengths will be same!!
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