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4x + 10 + 10x - 20 = 130
4x + 10x =130 - 10 + 20
14x = 140
x = 140 : 14 = 14
AO =x - 3
= 14 - 3 = 11
BO =3x + 2
= 3.14 + 2 =30
CO = 3x - 6
= 3.14 - 6 =36
panjang D1 = 30 + 36 = 66 cm
D2 =11 + 11 = 22 cm
L = 66 cm x 22 cm = 1452 = 726 cm²
2 2