Free Professional Development

Or

Geometry

Polygons are plane figures made of straight lines, like triangles and quadrilaterals. Using Triangles to Find the Sum of Interior Angles will help elevate your mastery in preparation for Trigonometry while Calculating the Perimeter of a Rectangle will refine basic Geometry skills. Learn to distinguish between shapes in Identifying Polygons and explore the first level of basic skills in Perimeter Formula. Whether you are finding the Perimeter of Irregular Polygons or Calculating the Perimeter of a Triangle, this course offers multiple levels and concepts that are sure to challenge you.

- Perimeter Formula
- Calculating the Perimeter of a Triangle
- Using Triangles to Examine Quadrilaterals
- Calculating the Perimeter of a Rectangle
- Polygons
- Identifying Polygons
- Regular Polygons
- Regular Pentagon
- Regular Hexagon
- Regular Octagon
- Regular and Irregular Polygons
- Perimeter of Regular Polygons
- Perimeter of Irregular Polygons
- Diagonal
- Diagonals in Regular Polyons
- Regular Polygon Diagonals Practice
- Interior Angles
- Using Triangles to Find the Sum of Interior Angles
- Sum of Interior Angles in a Polygon
- Calculating Angles of a Regular Polygon
- Solving for the Missing Angle of a Polygon
- The Exterior Angles of a Polygon
- Sum of the Exterior Angles of a Polygon

Study fundamental topics in college-level algebra with emphasis on application.

Grasp core concepts of statistics such as probability distributions, approximations, and hypothesis-testing.

Pathways are a sequence of tutorials that help you learn a whole subject area, one concept at a time. Choose from multiple teachers and teaching styles.

The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 27 of Sophia's online courses for college credit. These courses are eligible to transfer to many different colleges and universities.