Section 9.3 Prealgebra 2e
Read Section 9.3: Use Properties of Angles, Triangles, and the Pythagorean Theorem (7 minutes).
OpenStax, Rice University - 2015
Click https://openstax.org/books/prealgebra-2e/pages/9-3-use-properties-of-angles-triangles-and-the-pythagorean-theorem link to open resource.