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penyikunya --> 90-x
pelurusnya --> 180-x
pelurus = 5 x penyiku
180 - x = 5 ( 90 - x)
180 - x = 450 - 5x
5x - x = 450 - 180
4x = 270
x = 270/4
x = 67,5°
semoga membantu ya :)