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maka luas segitiga = 8 × 4√3 / 2 = 16√3
v prisma = luas alas × tinggi prisma
= 16√3 × 10 = 160√3
19. 2 cos 75 sin 25
= 2 × ½ ( sin (75+25) + sin (75-25)
= sin 100 + sin 50