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52 = 4s
s = 13 cm
d2 = √(13²-12²) × 2
d2 = √(169-144) × 2
d2 = √25 × 2 = 5 × 2
d2 = 10 cm
V limas = 1/3 × La × t
V limas = 1/3 × 1/2 × 24 × 10 × 12
V limas = 8 × 5 × 12
V limas = 480 cm³
b. luas alas = 120
v = 1/3 x luas alas x tinggi = 1/3 x 120 x 12 =480