Question

formula of quadrilateral chapters

Answer 1

regular polygon of N sides we have :

1. Each exterior angle = (360/n) degree
2. Each interior angle = 180 degree - ( each exterior angle )

a convex polygon of N sides we have
1. sum of all exterior angle = 4 right angle S
2. sum of all interior angles = (2n-4) right angle
S

diagonals in a polygon of N sides = n (n-3)/2