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Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. It’s all free for learners and teachers.
This Basic geometry and measurement course is a refresher of length, area, perimeter, volume, angle measure, and transformations of 2D and 3D figures. If you are learning the content for the first time, consider using the grade-level courses for more in-depth instruction.
In this topic, we'll learn about special angles, such as angles between intersecting lines and triangle angles. Next, we'll learn about the Pythagorean theorem. Finally, we'll find volume of curved 3D shapes like spheres, cones, and cylinders.
Learn eighth grade math—functions, linear equations, geometric transformations, and more. (aligned with Common Core standards)
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High Quality Prep for every section of the digital SAT with guidance from Khan Academy’s team of math, reading, and writing experts. Free Access all of our digital SAT prep materials for free—anytime, anywhere.
Geometric shapes are all around us. The world is built with them. In this series of tutorials and exercises you'll become familiar with Euclidean geometry and terms like scale drawings, parts of a circle, area, angles, and geometric figures.
The Mathematics 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a function; Exponential models; Introductory statistics; and Geometric transformations and congruence.