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tinggi² = 8² - 4²
tinggi = 4√3
2. mencari volume limas
v = 1/3 x la x tinggi
v = 1/3 x 1/2 x 8 x 4√3 x 9
v = 4 x 4√3 x 3
v = 16√3 x 3
v = 48√3