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Example: Finding Missing Angles in Triangle

 Post to:   Explanation:

# Vertical angles Two lines intersect to create two pairs of vertical angles. One pair consists of angles A and B; the second pair consists of angles C and D.

In geometry, a pair of angles is said to be vertical (also opposite and vertically opposite, which is abbreviated as vert. opp. s) if the angles are formed from two intersecting lines and the angles are not adjacent. They all share a vertex. Such angles are equal in measure and can be described as congruent. (Our solved example in mathguru.com uses this concept)

http://en.wikipedia.org/wiki/Vertical_angles

The sum of all the angles of a Triangle is 180 (Angle Sum Property of a Triangle)