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Alas = 16 cm
Tinggi = 12 cm
Segitiga PQR
Alas = x
Tinggi = 9 cm
x/16 = 9/12
12x = 144
x = 12 cm
Luas segitiga PQR = 1/2 × alas × tinggi
= 1/2 × 12 × 9
= 54 cm