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L = 1/2 x 12 x 9 x sin 120
L = 6 x 9 x 1/2akar 3
L = 27akar3
p = 12
q = 9
R = 120 derajat
12x + 9x = 180 - 120
21x = 60
x =
r =
Luas =
L = √2.863,4375