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cara : AC = DB
2x + 8 = 4x - 2
8 + 2 = 4x - 2x
10 = 2x
5 = x
maka AB = x + 6 = 5 + 6 = 11 cm
BC = x + 2 = 5 + 2 = 7 cm
b) K = 2 (p+l) = 2 (AB + BC)
= 2 (11 + 7)
= 2 (18)
= 36 cm
c) L = p.l = AB.BC
= 11.7
= 77 cm²