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= (jumlah panjang sisi sejajar x tinggi / 2) x tinggi P.trapesium
Luas permukaan P.trapesium = (2 x L alas) + (K alas x tinggi P)
Volume P.jajargenjang = L alas x tinggi P
= (a x t) x tinggi P
Luas permukaan P.jajargenjang = (2 x L alas) + (K alas x tinggi P)