regular polygon angle measures

octagon

sum of interior angles: 1080° each interior angle: 135° sum of exterior angles: 360° each exterior angle: 45°

nonagon

sum of interior angles: 1260° each interior angle: 140° sum of exterior angles: 360° each exterior angle: 40

decagon

sum of interior angles: 1440° each interior angle: 144° sum of exterior angles: 360° each exterior angle: 36°

triangle

sum of interior angles: 180° each interior angle: 60° sum of exterior angles: 360° each exterior angle: 120°

quadrilateral

sum of interior angles: 360° each exterior angle: 90° sum of exterior angles: 360° each exterior angle: 90°

Pentagon

sum of interior angles: 540° each interior angle: 180° sum of exterior angles: 360° each exterior angle: 72°

Hexagon

sum of interior angles: 720° each interior angle: 120° sum of exterior angles: 360° each exterior angle: 60°

heptagon

sum of interior angles: 900° each interior angle: 128 and 4/7° sum of exterior angle: 360° each exterior angle: 51 and 3/7°

polygon with 'n' sides

sums of interior angles: n-2(180) each interior angle: (n-2(180)) divided by n sum of exterior angles: 360° each exterior angle: 360/n