angles in polygons

• The sum of the exterior angles is always equal to 360 degrees.
• An equilateral triangle is a type of regular polygon with three sides and three equal angles.
• A regular polygon has all sides and interior angles congruent, while an irregular polygon does not have this property.
• A square is a quadrilateral that has four right angles, all sides are congruent, and opposite sides are parallel.
• A rectangle is a quadrilateral that has two pairs of adjacent sides that are both parallel and congruent.
• To find the perimeter of a regular polygon, add up the lengths of all its sides.
• equation to find one interior angle

  180 (n-2) / n
• find one exterior angle

  360/n
• what's the sum of a hexagon ???

  180 (n-2)

  180 (6-2) = 180 x 4 = 720 degrees
• find out 1 interior angle of a pentagon ????

  180 (n-2)/n

  180 (5-2)/5 = 180 x 3 / 5 = 540/5 = 108 degrees