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Figura N° 1:
x = 180° - y
x + y = 180°
LUEGO:
x = 140° (Ángulo central)
y = 40°
Figura N° 2:
2x + 3x + 4x = 360°
9x = 360°
x = 40°
LUEGO:
y = 4x/2 = 2x = 2(40°) = 80°
Figura N° 3:
x + 3x = 180°
4x = 180°
x = 45°
Luego:
y = 3x/2 = 3(45°)/2 = 67,5° = 67°30'
Figura N° 4:
Arco AD = 2(43°) = 86°
Luego:
x = (70° + 86°)/2 = 78°
Ojo: El ∠ BAD = 120°/2 = 60°
Hallamos "y", por ángulo exterior:
y = 60° + 43° = 103°
ESO ES TODO, SALUDOS.......................