STEM

# Basic Principles of Geometry

146 CQ
35 Lessons
Previous...
• Playing
4 CQ
26. Beginning Proofs | Level 2
A lesson with Math Fortress

In this lesson, Math Fortress presents and proves two basic theorems in geometry, the right angles theorem and the straight angles theorem.

In this lesson, Math Fortress presents and proves two basic theorems in geometry, the right angles theorem and the straight angles theorem.

• Playing
4 CQ
27. Beginning Proofs | Level 3
A lesson with Math Fortress

Follow along to three examples that illustrate how to use previously proven theorems, assumptions, and properties in order to write a geometric proof.

Follow along to three examples that illustrate how to use previously proven theorems, assumptions, and properties in order to write a geometric proof.

• Playing
5 CQ
28. Division of Segments & Angles | Level 1
A lesson with Math Fortress

Learn how to identify midpoints, bisectors of segments, trisection points, trisectors of segments, adjacent angles, angle bisectors, and angle trisectors.

Learn how to identify midpoints, bisectors of segments, trisection points, trisectors of segments, adjacent angles, angle bisectors, and angle trisectors.

• Playing
4 CQ
29. Division of Segments & Angles | Level 2
A lesson with Math Fortress

In this lesson, continue building basic geometry skills by completing six proofs that explore the division of segments and angles as covered in lesson one.

In this lesson, continue building basic geometry skills by completing six proofs that explore the division of segments and angles as covered in lesson one.

• Playing
5 CQ
30. Division of Segments & Angles | Level 3
A lesson with Math Fortress

In this lesson, continue building basic geometry skills by reviewing nine different examples that demonstrate the division of segments and related concepts.

In this lesson, continue building basic geometry skills by reviewing nine different examples that demonstrate the division of segments and related concepts.

More...
• Recommended Recommended
• History & In Progress History
• Browse Library
• Most Popular Library

### Get Personalized Recommendations

Let us help you figure out what to learn! By taking a short interview you’ll be able to specify your learning interests and goals, so we can recommend the perfect courses and lessons to try next.

You don't have any lessons in your history.
Just find something that looks interesting and start learning!