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= L alas x tinggi
= 1/2 x a x t x t prisma
= 1/2 x 3 x 4 x 15
= 1/2 x 180
= 90 cm³
Luas Δ(alas) = alasxtinggi/2 = 3x4/2 = 6 cm² (5 cm tidak dipakai karena merupakan sisi miring)
Volume prisma = 6 x 15 = 90 cm³
Maaf kalau salah..