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L = 1800
1/2 x (a+b) x t = 1800
1/2 x (a+b) x 30 = 1800
15 x (a+b) = 1800
a+b = 1800 : 15
a+b = 120
jadi, jmlah pnjang kdua sisi sjajarnya 120 m
2)
d2 = 2 x L / d1
= 2 x 112 / 14
= 2 x 8
= 16 cm