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y : 1/4 y
4(y) : 1/4(4)(y)
4y : y
sudut + pelurus = 180
4y + y = 180
5y = 180
y = 180 : 5
y = 36
maka sudut itu = 4y = 4 x 36 = 144 derajat
maka pelurusnya = y = 36 derajat
180 - a = 1/4 a
180 = a + 1/4 s
180 = 5/4 a
a = 180 x 4/5
a = 144°
semoga membantu ya :)