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V = 1/3 (10² x 12)
V = 100 x 4
V = 400 cm³
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t² = 12²+5²
t² = 144 + 25
t² = 169
t = √169
t = 13 cm
L = luas alas + 4(sisi tegak)
= 10² + 4 (10.13 / 2)
= 100 + 260
= 360 cm²