exam Maths Puzzle Numerical Ability

How do I find the formula for the number of diagonals in a polygon with "n" sides?

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exam Other Question

The point (-1/2,sqrt3/2) on the unit circle is rotated 60 degrees clockwise. Determine the coordinates of the new point. Can someone please help me figure this out?

Find two consecutive positive integers such that the sum of their squares is 85.