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dan segitiga kecil mempunyai sisi miring 6 cm, dan QR adalah alas segitiga kecil (segitiga b)
perbandingannya
sisi miring a/ sisi miring b = alas a/ alas b
10/6=6/ alas b
kali silang
36= 10× alas b
3,6 = alas b = QR