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a. AD = BC
2x+5 = x+7
2x-x = 7-5
x = 2
b. AD = 2x+5
= 2(2)+5 = 9
c. sudut yang berhadapan sama besar,
jumlah ke empat titik sudut = 360 drjt
BAD = BCD = 60
ABC = 180 - BAD= 180-60 = 120 drjt
2x+5=x+7
x=2
karena sejajar...
b. panjang AD = 2x+5=4+5 =9
c. sudut BAD = 60°
sudut ABC = 30°
semoga membantu:-)