Polygons 3 triangle 8 octagon 4 quadrilateral 9 nonagon pentagon 10

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Presentation transcript:

Polygons 3 triangle 8 octagon 4 quadrilateral 9 nonagon pentagon 10 sides name sides name 3 triangle 8 octagon 4 quadrilateral 9 nonagon pentagon 10 decagon 5 6 hexagon 11 11-gon 7 heptagon 12 dodecagon

y° 168° 162° 135° 101° 51° 62° 134° 70° x° 154° 131°

30° 12° h° 79° 18° 45° 46° 129° 49° 26° z° 58°

(y + 70)° y° (y + 30)° 2y° (2y - 10)° 2y° 9y + 90 = 720° y = 70

108° 108° 108° 108° 108° 540 = 108° 5

Decagon Determine each interior angle of a regular octagon Each interior angle of a regular polygon is 144° Determine the polygon 1080 interior = 135° = 144° 8 sides 1440 Decagon 10 720 900 1080 1260 6 7 8 9

360 6 y° = 60° Determine each exterior angle of a regular octagon Name the regular polygon with an exterior angle of 30° 360 = 45° 360 Dodecagon = 30° 8 12 ?