Things to remember:

• The sum of all the three interior angles of a triangle is 180 degrees.

Suppose ABC is a triangle, then as per this theorem;

∠A + ∠B + ∠C = 180°

• Understand Ratio and Scale Factor

Lessons to View

• Angle-Angle (AA) Side-Angle-Side (SAS) Side-Side-Side (SSS)

• Analyze and write proofs in three formats: paragraph proof, two-column proof, flow diagram proof.

  • https://calcworkshop.com/reasoning-proof/two-column-proof/

• Prove theorems about lines and angles including the alternate interior angles theorems, perpendicular bisector theorems, and same side interior angles theorems.

  • https://www.onlinemathlearning.com/prove-lines-angles-hsg-co9.html

• Use theorems about angles and lines to solve problems. Determine if lines are parallel using theorems about angles.

• Prove theorems about triangles in multiple formats