# Basic geometry

Learn the basics of geometry—the core skills you'll need for high school and college math.

From Khan Academy 21 English Mathematics

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## Courses in this Topic

Listed in the order in which they should be taken

Starts Course Information

On Demand

Learn what lines, line segments, and rays are and how to use them.This course contains 2 segments:Lines, line segments, and raysLet's draw points, lines, line segments, and rays. ...

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On Demand

In this topic, we will learn what an angle is and how to label, measure and construct them. We will also explore special types of angles.This course contains 6 segments:Angle...

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On Demand

Classify shapes and solve problems using what we know of the properties of shapes.This course contains 6 segments:Properties of shapesLearn how different shapes have different...

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On Demand

We use coordinates to describe where something is. In geometry, coordinates say where points are on a grid we call the "coordinate plane".This course contains 6...

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On Demand

Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and...

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On Demand

Volume and surface area help us measure the size of 3D objects. We’ll start with the volume and surface area of rectangular prisms. From there, we’ll tackle trickier objects, such...

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On Demand

The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. In this topic, we’ll figure out how to...

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On Demand

Learn about geometric transformations and how they're used to understand the meaning of "similar" and "congruent".This course contains 8 segments:Line of symmetryA line of...

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