Ответ:
1) х + (х ÷ 4) = 180°
х = 144 (угол 2)
1 = 144 ÷ 4 = 36°
3 = 2 = 144°
2) 1 = 2 = 50°
3 = 180° - 50° = 130°
3) 2х + 7х = 180°
9х = 180°
х = 20°
1 = 20 × 2 = 40°
2 = 20 × 7 = 140°
3 = 2 = 140°
4) х + х + 90° = 180°
2х = 90°
х = 45°
1 = 45°
2 = 135°
3 = 1 = 45°
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Ответ:
1) х + (х ÷ 4) = 180°
х = 144 (угол 2)
1 = 144 ÷ 4 = 36°
3 = 2 = 144°
2) 1 = 2 = 50°
3 = 180° - 50° = 130°
3) 2х + 7х = 180°
9х = 180°
х = 20°
1 = 20 × 2 = 40°
2 = 20 × 7 = 140°
3 = 2 = 140°
4) х + х + 90° = 180°
2х = 90°
х = 45°
1 = 45°
2 = 135°
3 = 1 = 45°