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QR=10 cm (sisi miring)
PQ=BC=8 cm (tinggi)
PR=√(QR²-PQ²)
PR=√(10²-8²)
PR=√(100-64)
PR=√36
PR=6
L=1/2at
L=1/2 x 6 x 8
L=24 cm²
AB = RP (tinggi)
BC = PQ = 8cm (alas)
CA = QR = 10cm (Sisi miring)
mencari AB = RP :
√10²-8² = √100-64 = √36 = 6cm
Luas segitiga PQR :
= 1/2.a.t
= 1/2.8.6 = 24cm²
Good Luck! :D