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T = 24
p. alas = 20
dit : tinggi segitiga pada alas limas??
jwb : v = 1/3 × 1/2 × alas × t × T
1.120 = 1/3 × 1/2 × 20 × t × 24
1.120 = 80 t
t = 1.120/80
t = 14 cm