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L = 1/2 x a x t
= 1/2 x 3 x 4
= 3 x 2
= 6 cm²
jawabannya A
NOMER 9
luas = a x t : 2
135 = 18 x t : 2
135 x 2 = 18 x t
270 = 18 t
270 : 18 = t
15 = t
jawabnnya A