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## Answers

The Brainliest Answer!

**See the attached figure:**

**To prove: angle A + angle B + angle C = 180°**

**Draw line through B parallel to AC and label two points D and E.**

**angle ABD + angle ABC + angle CBE = 180°- (1) (because DE is a straight line)**

**angle ABD = angle BAC (Alternate interior angles) - (2)**

**angle CBE = angle BCA (Alternate interior angles) - (3)**

**Substitute values for angle ABD and angle CBE in - (1)**

**angle BAC + angle ABC + angle BCA = 180**

**Thus,**

**angle A + angle B + angle C = 180°****Proved.**