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Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more. (aligned with Common Core standards)
Learn geometry—angles, shapes, transformations, proofs, and more. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Geometry is the fourth math course in high school and will guide you through among other things points, lines, planes, angles, parallel lines, triangles, similarity, trigonometry, quadrilaterals, transformations, circles and area.
Get ready for high school geometry! Learn the skills that will set you up for success in congruence, similarity, and triangle trigonometry; analytic geometry; conic sections; and circles and solid geometry.
examples with step by step solutions, free video lessons suitable for High School Geometry: Geometry Building Blocks, Congruent Similar Triangles, Properties of Polygons, Shapes, Solids, Transformations, Geometry Proofs, Constructions, Circles, Pythagorean Theorem, Trigonometry.
Download ready-to-teach resources for geometry. Help students explore Proofs, Congruence, Dilations, Right Triangles, Algebraic Relationships, and Circles.
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.
