SOLUTION: ABC is an isosceles triangle. Its two sides AB and AC are equal to one another. It’s BAC = 20 degree. The baseline BC is extended upto D. Of how many degrees is the angle ACD?

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Question 1065081: ABC is an isosceles triangle. Its two sides AB and AC are equal to one another. It’s BAC = 20 degree. The baseline BC is extended upto D. Of how many degrees is the angle ACD?
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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ACD is the exterior angle.

It is supplementary angle to the angle ACB.

Angle ACB is %28180-20%29%2F2 = 80 degrees.

Hence, angle ACD is 180-80 = 100 degrees.

Solved.