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s² = 4²+3²
s² = 16+9
s² = 25
s = √25
s = 5 cm
L sisi tega = 4s.tinggi
160 = 4.5 . t
160 = 20t
t = 8 cm
V = luas alas.tinggi
= 6.8 / 2.8
= 24.8
= 192 cm³