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Pada jajargenjang.
EF = GH
FG = EH
Sehingga:
K = 40
2(EF + GH) = 40
EF + FG = 20
(x+2)+x = 20
2x + 2 = 20
2x = 20-2
2x = 18
x = 18/2
x = 9
Sehingga:
EF = x+2
EF = 9+2
EF = 11 cm
FG = x
FG = 9 cm
Pilihan yang tepat : B
40 = (x + 2) + x + (x + 2) + x
40 = 4x + 4
4x = 36
x = 9
Sisi EF = x + 2
= 9 + 2
= 11 cm
Sisi FG = x
= 9 cm
Jawaban : b. 11 cm dan 9 cm