if angle ABC; an angle (ACD = 108 them find angle (ACB) =?
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Given = angle ACD =108
To find =angle (ACB) =?
Here, from given condition,
Angle ACD is the exterior angle of Triangle ACB.
therefore, angle A +angle B+angle C=180......(1)
hence, 108 + angle ACD =180.........( by remote interior angles theorem.)
therefore,
angle ACD=72 degree.
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