Angle Measures in a Triangle First watch video, then do VML 7th grade, Module 6, Lesson 2: Angle Measures in a Triangle
Congruent Figures First watch video, then do VML 7th grade, Module 6, Lesson 3: Congruent Figures: Find Values
Area of a Triangle
First watch video, then do VML 7th grade, Module 7, Lesson 2: Area of a Triangle

http://www.virtualnerd.com/middle-math/geometric-figures/angles/transversal-definition
 What is a transversal?
http://www.virtualnerd.com/middle-math/geometric-figures/angles/complementary-angles-definition
What are complementary angles?
http://www.virtualnerd.com/middle-math/geometric-figures/angles/supplementary-angles-definition

What are supplementary angles?