My Enrolled Courses My Enrolled Courses Elementary Grades Mathematics Advanced Mathematics Science American History Stories from around the world Mathematics Advanced Mathematics Science American History Stories from around the world Middle School Mathematics : Pre-Algebra Mathematics : Algebra – 1 Mathematics : Geometry Mathematics : Pre-Algebra Mathematics : Algebra – 1 Mathematics : Geometry High School Basic Mathematics : Pre-Algebra Mathematics : Algebra – 1 Geometry Basic Mathematics : Pre-Algebra Mathematics : Algebra – 1 Geometry 9.99 Perimeter and Areas of Geometric Shape Start Learning 9.99 Classification of Geometric Shapes Start Learning Enroll Now Angles and Lines, Intersecting Lines & Parallel Lines Start Learning 9.99 3D Shapes, Surface Area and Volume Start Learning Enroll Now Basic Properties of Triangles Start Learning Enroll Now Congruent Triangles Start Learning 9.99 Similar Triangles Start Learning