Analyzing Complicated Geometric Shapes: Lesson

Equal Triangular Areas (grade 4): https://www.youtube.com/watch?v=LI84ZLfI7Hk&list=PLytgs3PKtgQ79qhKNz7t-uWsMtSBCRQbN

Solving for Lengths and Angles (grade 4): https://www.youtube.com/watch?v=JIz_2eb98Fo&list=PLytgs3PKtgQ6lSSb3bv351j4yp3xXzjt0

Dovetail Theorem: see in this video's same playlist

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