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820 = ( 2 x 1/2 x 16 x 30) + (4 x 17 x t)
820 = 480 + 68t
68t = 820 - 480
68t = 340
t = 5 cm
volume prisma = luas alas x tinggi prisma
= 1/2 x 16 x 30 x 5
= 1.200 cm³ (a)
semoga membantu ya :)