It is known that: as shown in the figure, in △ ABC, the bisector am of ∠ C = 90 °, BAC = 60 ° is 15cm, and the length of BC is calculated

It is known that: as shown in the figure, in △ ABC, the bisector am of ∠ C = 90 °, BAC = 60 ° is 15cm, and the length of BC is calculated

∵ am is the bisector of ∵ BAC, ∵ BAC = 60 °, ∵ MAC = 30 °, ∵ MC = 12am = 7.5cm, ∵ AC = am2-mc2 = 152-7.52 = 1523, ∵ in △ ABC, ∵ C = 90 °, ∵ BAC = 60 °, ∵ ABC = 30 °, ∵ AB = 2Ac = 153, ∵ BC = ab2-ac2 = (153) 2 - (1523) & nbsp; 2 = 452