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S(C(90-x)=5x
S(90-(90-x)=5x
S(x)=5x
180-x=5x
180=6x
30=x
SCCα=5α
180°-{90°-[90°-α]}=5α
180°-α=5α
180°=6α
30°=α
El ángulo es 30°