Polygons

• Convex - at least one angle measures more than 180 degrees.
• Concave- measure of the interior angle is less than 180 degrees
• A polygon is a 2 dimensional figure that consists finite number of sides.
• Regular polygons - has equal sides and angles
• Irregular polygons - all sides and angles are not equal
• Trigons - has 3 sides and are triangles
• Scalene Triangle: all sides that are unequal
• Isosceles Triangle: 2 sides are equal
• Equilateral Triangle: all sides and angles are equal and are 60 degrees.
• Quadrilateral - polygon with 4 sides and vertices
• Equilateral - all sides are equal
• Right angle - 90 degrees
• Reflex angle - more than 180
• Acute angle - less than 90
• Obtuse angle - above 90 but less than 180
• Straight angle - 180
• Formula of Interior Sum: (s-2) 180
• Formula of each exterior angle: 360/2
• Formula of regular polygon: (s-2) 180 / s
• Formula of diagonals: s/2 (s-3)