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axt / 2 =
3x4 / 2
12/2 = 6 .
19.
tinggi b ketemu jadi pake teorema pythagoras .
t = 5 kuadrat - 4 kuadrat
25 - 16 = 9
L = axt / 2
4x9 / 2
36 / 2 = 18 .
tapi tak ada isi nya no. 19 .? .