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pelurus = x
1/4x + x = 180
1/4x + 4/4x = 180
5/4x = 180
4/5 × 5/4x = 4/5 × 180
x = 144
maka besar pelurus = 144 derajat
maka besar sudut itu = 1/4x = 1/4 × 144 = 36 derajat