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Geometry Level 1

In a A B C \triangle {ABC} , A B \overline {AB} = B C \overline {BC} = A C \overline {AC} . B C \overline {BC} is extended to point D. Find A C D \angle {ACD} .


The answer is 120.

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1 solution

Rahil Kadakia
Jul 26, 2014

Since A B \overline {AB} = B C \overline {BC} = A C \overline {AC} , the triangle is equilateral. Property of equilateral triangle- All interior angles are 60º. Therefore by linear pair, A C D \angle {ACD} =120º.

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