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Estudando o ciclo trigonométrico, sabemos que o valor de 180° equivale a π, sendo assim, podemos fazer uma regra de três:
a) 180 --- π
X --- π/6
π * X = 180 * π/6
X = 180/6
X = 30°
b) 180 --- π
X --- π/5
X * π = 180 * π/5
X = 180/5
X = 36°
c) 180 --- π
X --- 2π/3
X * π = 180 * 2π/3
X = 180 * 2/3
X = 360/3
X = 120°
d) 180 --- π
X --- π/4
X * π = 180 * π/4
X = 180/4
X = 45°
e) 180 --- π
X --- 5π/6
X * π = 180 * 5π/6
X = 180 * 5/6
X = 900/6
X = 150°
f) 180 --- π
X --- 11π/6
X * π = 180 * 11/6
X = 180 * 11/6
X = 1980/6
X = 330°
g) 180 --- π
X --- 3π/8
X * π = 180 * 3π/8
X = 180 * 3/8
X = 540/8
X = 67,5°
h) 180 --- π
X --- π/16
X * π = 180 * π/16
X = 180/16
X = 11,35°
a) 180 --- π
X --- π/6
π * X = 180 * π/6
X = 180/6
X = 30°
b) 180 --- π
X --- π/5
X * π = 180 * π/5
X = 180/5
X = 36°
c) 180 --- π
X --- 2π/3
X * π = 180 * 2π/3
X = 180 * 2/3
X = 360/3
X = 120°
d) 180 --- π
X --- π/4
X * π = 180 * π/4
X = 180/4
X = 45°
e) 180 --- π
X --- 5π/6
X * π = 180 * 5π/6
X = 180 * 5/6
X = 900/6
X = 150°
f) 180 --- π
X --- 11π/6
X * π = 180 * 11/6
X = 180 * 11/6
X = 1980/6
X = 330°
g) 180 --- π
X --- 3π/8
X * π = 180 * 3π/8
X = 180 * 3/8
X = 540/8
X = 67,5°
h) 180 --- π
X --- π/16
X * π = 180 * π/16
X = 180/16
X = 11,35°
naiury2011:
Muito obrigado!!
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