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1 ) ∠ 1 = 90° - 30° = 60° ;

2 ) ∠ 2 = 70° ; ∠ 1 = 180° - 2*70° = 40° ;

3 ) ∠ 1 = ∠2 = 90° : 2 = 45° ;

4 ) ∠ 1 = ∠ 2 = ∠ 3 = 180° : 3 = 60° ;

5 ) ∠ 1 + ∠ 2 = 150° ; ∠ 1 = ∠ 2 = 150° : 2 = 75° ; ∠ 3 = 180° - 150° = 30°.

6 ) ∠ 1 + 20° = 40° ; ∠ 1 = 40° - 20° = 20° ; ∠ 2 = 180° - 40° = 140° .