math Q4

• polygon - a union of non-collinear segments
• vertex - endpoint
• sides - segments
• equilateral - if all the sides are equal
• equiangular - all angles are equal
• regular - both side and angles are equal
• pentagon - 5 sides
• hexagon - sic sides
• heptagon - seven sides
• octagon - 8 sides
• nonagon - 9 sides
• decagon - 10 sides
• dodecagon - 12 sides
• undecagon - 11 sides
• these line segments also known as sides meet a common point which is called vertex
• regular polygon - has all equal sides and angle
• irregular polygon - has unequal sidea and angles
• sum of three interior angle is - 180 degree
• diagoal line - line segment that joins one vertex of a polygon to another
• (n-2)(180) - formula of how to get the interior angles
• exterior angle - an angle formed by one side or the polygon and an extended adjacent side
• the interior angle and an exterior angle on the same vertex are supplementary and their sum is 180 degrees