Explicación paso a paso:
3)
Todos los ángulos interiores suman 180°
2x + y + (180° - y - 80°) + 50° + x = 180°
3x + y + 180° - y - 80° + 50° = 180°
3x - 50° = 180° - 180°
3x = 50°
x = 50° / 3
4)
80° + 20° + x = 180°
100° + x = 180°
x = 180° - 100°
x = 80°
5) B = 90°
2x + 50° + 90° = 180°
2x + 140° = 180°
2x = 180° - 140°
2x = 40°
x = 40°/2
x = 20°
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Explicación paso a paso:
3)
Todos los ángulos interiores suman 180°
2x + y + (180° - y - 80°) + 50° + x = 180°
3x + y + 180° - y - 80° + 50° = 180°
3x - 50° = 180° - 180°
3x = 50°
x = 50° / 3
4)
80° + 20° + x = 180°
100° + x = 180°
x = 180° - 100°
x = 80°
5) B = 90°
2x + 50° + 90° = 180°
2x + 140° = 180°
2x = 180° - 140°
2x = 40°
x = 40°/2
x = 20°