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= 12 cm²
2. AD = BD = 4 cm
Luas = 1/2 x (BD+DC) x AD
Luas = 1/2 x (6+4) x 4
Luas = 1/2 x 10 x 4
Luas = 5 x 4 = 20 cm²
3 dan 4 soalnya masih kurang jelas...
Tolong di Fix lagi...
Sorry Kalau salah