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Andrew Larned · Answer 1 · 2021-09-17T22:35:43+0000

AD = AE and AD || BC are important to note

First we calculate the triangle. Here AD = AE is important.
180-54 = 126
126/2 = 63

And since AD and BC are on the same line, the angles are the same, because AD || BC.

So BCD = 63 degrees

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