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4x-2x=-10+80
2x=70
x=35
<FCD=180-(4x-80)
=180-(4.35-80)
=180-(140-80)
=180-60
=120
Bila diketahui : ACD = 4x - 80 dan EFH = 2x - 10
ACD = EFH
4x - 80 = 2x - 10
4x - 2x = -10 + 80
2x = 70
x = 70/2 = 35 derajat (jawaban untuk poin A)
Maka, besar ACD = 4x - 80 = 4(35) - 80 = 60 derajat
Besar sudut FCD = 180 - sudut ACD = 180 - 60 = 120 derajat
:))