SOLUTION: Proved that angle ADC=90·-1/2angle ACB, ABC IS triangle and angle ACB is external angle

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Question 1043231: Proved that angle ADC=90·-1/2angle ACB, ABC IS triangle and angle ACB is external angle
Answer by ikleyn(52824) About Me  (Show Source):
You can put this solution on YOUR website!
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Proved that angle ADC=90·-1/2angle ACB, ABC IS triangle and angle ACB is external angle
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It doesn't make sense. Because

1. The point D is not defined, and

2. If ABC is triangle, then ACB can not be its exterior angle.

Notice. There are exterior angles. Do not use the term "external angle". There is no such term.