Lesson 4.3 - Using Congruent Triangles

In lessons 4.1 and 4.2 our goal was to prove figures and triangles were congruent using “side-angle-side”, “side-side-side”, and “angle-side-angle”.

The goal in 4.3 is to deduce information about segments or angles after we have show triangles are congruent by using CPCT.

The definition of a line perpendicular to a plane is: “A line and a plane are perpendicular to eachother if and only if they intersect and the line is perpendicular to all lines in the plane that pass through the point of intersection