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2.A 5cm
3.B 6akar3
2) a² + b² = c²
4² + 3² = c²
16 + 9 = c²
25 = c²
√25 = √c²
5 = c
3) KM : LM : KL = 1 : 2 : √3
KM : KL = 1 : √3
6 : KL = 1 : √3
6 × √3 = KL × 1
6√3 = KL
4) QR : PR : PQ = 1 : 2 : √3
PQ : PR = 2 : √3
12 : PR = 2 : √3
12 × √3 = PR × 2
12√3 = 2PR
6√3 = PR
5) A. 12, 5, 13