DE is a tangent to the circumcircle of ∆ ABC at the

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DE is a tangent to the circumcircle of ∆ ABC at the vertex A such that DE|| BC. If AB = 17 cm, then the length of AC is equalto

As per the given in question , we draw a figure

DE || BC
∴ ∠DAB = ∠ABC
∠EAC = ∠ACB
Hence, ABC is equilateral triangle.
∴ side AB = AC = BC = 17 cm