Answer:
the sum of all angles in triangle is equal to 180°
Explanation:
1 = 2 = 3 = 4 = 90° (360° / 4)
9 = 180° - 21° - 90° = 69°
10 = 180° - 59° - 90° = 31°
5 = 59°
6 = 21°
7 = 9 = 69°
8 = 10 = 31°
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