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a-b = 25
------------------- +
2a = 205
a= 102.5
maka
102.5 + b = 180
b=77.5
pelurus = y
x + y = 180
x - y = 25 -
2y = 155
y = 77,5
x + y = 180
x + 77.5 = 180
x = 102,5
maka pelurus = 102,5 derajat dan sudutnya = 77,5 derajat. bisa juga sebaliknya