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= 13 cm
d2 = 2x
x² = 13²-12²
x² = 169-144
x² = 25
x = √25
x = 5
d2 = 2x = 2.5 = 10 cm
V = luas alas.tinggi
= 10 . 24/2 .25
= 120 . 25
= 3000 cm³