How many diagonals does a 63-sided convex polygon have? Choose the correct choice from the following options.
A) 3780 B) 1890 C) 3843 D) 3906 E) 1953
Explanatory Answer   The number of diagonals of an n-sided convex polygon = n(n−3)/2   This polygon has 63 sides. Hence, n = 63.   Therefore, number of diagonals = 63∗60 /2 = 1890.   Choice 1890
<result>B</result>
How many diagonals does a 63-sided convex polygon have?