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5x+5=180
5x=175
x=35
maka sudut A adalah
70-5=65 drajat
jumlah semua sudut jajargenjang=360 derajat(4 sudut)
maka 2 sudut = 360/2 = 180 derajat
180 = sudut A+sudut D
180 = 2x-5+3x + 10
180 = 5x - 5
5x= 180-5 = 175
x = 175/5 = 35
maka sudut A=2x35 - 5 = 70-5 = 65