The number of rectangles that can be obtained by joining four of the twelve vertices of a 12-sided regular polygon is 5 K, then the value of K is_____
The number of rectangles that can be obtained by joining four of the twelve vertices of a 12-sided regular polygon is 5 K, then the value of K is_____
A. 66
B. 30
C. 24
D. 15
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Correct Answer - D
Number of diagonals passing through centre = 6
number of rectangle `= .^(6)C_(2) = 15`
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