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18a = 180° / :18
a = 10°
b) 4a + 20°+ 3a + a = 180°
8a + 20° = 180° / -20°
8a = 160° / :8
a = 20°
c) 2a - 60°+ a + 3a - 120° = 180°
6a - 180° = 180° / -180°
6a = 0 / :6
a = 0°
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18a=180° |:18
a=11°
b) 4a + 20°+ 3a + a = 180°
8a=180°-20°
8a=160° |:8
a=20°
c) 2a - 60°+ a + 3a - 120° = 180°
6a=180°+60°+120°
6a=360° |:6
a=60°
18a = 180° / :18
a = 10°
4a + 20°+ 3a + a = 180°
8a + 20° = 180° / -20°
8a = 160° / :8
a = 20°
2a - 60°+ a + 3a - 120° = 180°
6a - 180° = 180° / -180°
6a = 0 / :6
a = 0°