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L = (a+b) x t / 2
= (10+18) x 3 / 2 = 28 x 3 / 2 = 14 x 3 = 42
semoga membantu, tolong jadikan jawaban terbaik
= √25 - 16
= √9
= 3 cm
LUas trape = (AB+CD) x t
2
= (18+10) 3
2
= 28 .3
2
= 42 cm² (A)