1. 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

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

3. 30°
12° h°
79°
18°
45°
46°
129°
49°
26° z°
58°

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

5. 108°
108°
108°
108°
108°
540
= 108° 5

6. 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

7. 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 ?