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x= 180-(45+50)
x=180-95
x=85
2.x=180-(40+90)
x=180-130
x=50
3.x=180-(40+40)
x=180-80
x=100
= 180 - (45+50)
= 180 - 95
= 85 derajat
2. besar sudut x (sudut siku-siku = 90 derajat)
= 180 - (90+40)
= 180 - 130
= 50 derajat
3. segitiga sama kaki, pada gambar x adalah kaki segitiga, maka nilai y = 40 derajat
besar sudut x
= 180 - (40+40)
= 180 - 80
= 100 derajat