Geometry lessons - School Yourself
Learn about lines, rays, and line segments. Angles and degrees. Learn what angles are, and how to measure them. Right, acute, and obtuse. Learn the names for angles of all sizes. Parallel lines. Lines that never, ever cross. Perpendicular lines. Lines that cross, forming right angles.
School Yourself - Free online math lessons
Learn for free! Interactive online math videos, lessons, and tutoring. Algebra, geometry, trigonometry, precalculus, and calculus!
Lines, rays, & segments - Geometry - School Yourself
Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures. Learn about functions, graphs, lines, …
Rotation - Geometry - School Yourself
Sensitivity vs. specifity, cutoff selection, and ROC curves. How rare a disease is, and how it affects PPV and NPV. Interactive math video lesson on Rotation: Rotating points and shapes around the origin - and more on geometry.
Right, acute, and obtuse - Geometry - School Yourself
Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures. Learn about functions, graphs, lines, and polynomials.
Trigonometry lessons - School Yourself
Trigonometry. Trigonometry helps you understand any topic that involves distances, angles, or waves. The trig functions (sin, cos, and tan) show up all over science and engineering. 1. Radians.
Angles and degrees - Geometry - School Yourself
Interactive math video lesson on Angles and degrees: Learn what angles are, and how to measure them - and more on geometry.
Vertical angles - Geometry - School Yourself
Interactive math video lesson on Vertical angles: Angles on opposite sides of intersecting lines - and more on geometry.
Congruence - Geometry - School Yourself
Interactive math video lesson on Congruence: When line segments, angles, or shapes are the same - and more on geometry.
Translation - Geometry - School Yourself
Interactive math video lesson on Translation: Moving points and shapes in the coordinate plane - and more on geometry.