SOLUTION: In triangle ABC, m∠A=53° and m∠B=84°. https://cds.flipswitch.com/tools/asset/media/613571 What is the measure of ∠ACD? m∠ACD=_____°.

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Question 1065932: In triangle ABC, m∠A=53° and m∠B=84°.

https://cds.flipswitch.com/tools/asset/media/613571
What is the measure of ∠ACD?
m∠ACD=_____°.
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.
The angle ACD is the exterior angle of the triangle ABC at bertx C.

The exterior angle of any triangle is the sum of the two other angles of the triangle:

m(ACD) = m(A) + m(B) = 53 + 84 degrees.


See the lesson
    - Sum of the interior angles of a triangle
in this site.

Also,  you have this free of charge online textbook on Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.

The referred lesson is the part if this textbook under the topic "Properties of triangles".



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