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AD = 8 cm
KL = 12 cm
KM = 15 cm
L tnp arsiran 36 cm²
L ∆= ½ .a.t
= ½. 12. 15
= 90 cm²
L prsg PJ= p x l
= 12 x 8
= 96
96-90= 6
Luas = 36 +6= 42 cm²