3x+x=90°
4x=90°
x=90/4
x=22,5
90 derajat = 4x
x. = 90/4
= 22.5
penyiku x = 90 - 22.5
= 67.5
jadi, jawabannya C. 67.5
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3x+x=90°
4x=90°
x=90/4
x=22,5
90 derajat = 4x
x. = 90/4
= 22.5
penyiku x = 90 - 22.5
= 67.5
jadi, jawabannya C. 67.5