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L = 1/2 (18)(10) + (18)(12)
L = 90 + 216
L = 306 cm²
10.
alas prima Δ siku siku , a= 18 dan b = 24
luas alas = 1/2 (18)(24)= 216
tinggi prisma = 15
V prisma = luas alas x tinggi
V = 216 x 15 = 3.240 cm³