For any regular polygon , the sum of the exterior angles is equal to 360 degrees. So, 360/n is the measure of any external angle. ( where n is the number of sides)
For any regular polygon , the sum of interior angles = (n-2)180 degrees. So measure of one angle in a
Square = 90
Pentagon =108
Hexagon =120
Heptagon =128.5
Octagon = 135
Nonagon = 140
Decagon =144
The sum of first n natural numbers = n
(n+1)/2
For the first n natural numbers, the sum of squares is n (n+1)(2n+1)/6
The sum of first n even numbers= n (n+1)
The sum of first n odd numbers= n^2
For the first n natural numbers, the sum of squares is n (n+1)(2n+1)/6
The sum of first n even numbers= n (n+1)
The sum of first n odd numbers= n^2
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