not equilateral concave not a polygon convex Regular Each Each Polygon Sum of Sum of Polygon Interior Exterior Interior Exterior Angle Angle Angles Angles Octagon 135° 45° Heptagon 900° 360° Decagon 144° 36° Dodecagon 1800° 360° 20-gon 162° 18° 15-gon 2340° 360° octagon 36-gon decagon pentagon 72-gon nonagon 158° = 49 x = 0.5 x = 4 y = 24 x = 12 x = 10 x = 3
not equilateral concave not a polygon convex Polygon Sum of Interior Angles Sum of Exterior Angles Heptagon 900° 360° Dodecagon 1800° 360° 15-gon 2340° 360° Regular Polygon Each Interior Angle Each Exterior Angle Octagon 135° 45° Decagon 144° 36° 20-gon 162° 18° octagon 36-gon decagon pentagon 72-gon nonagon 158° = 49 x = 0.5 x = 4 y = 24 x = 12 x = 10 x = 3
Geometry%20CP%20Midterm%20Review%202014.docx