In the triangle ABC, ab = AC, the perpendicular of AB intersects at point E, ab = 6cm, and the circumference of the triangle EBC is 10cm. Find the length of BC

Because e is the intersection of the perpendicular of AB and AC, EA = EB
So the perimeter of triangle EBC is: Rb + EC + BC = EA + EC + BC = AC + BC = 10
Because AB = AC = 6
So BC = 10-ac = 10-6 = 4 (CM)

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