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Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more (aligned with Common Core standards).

Two rays that share the same endpoint form an angle. Learn about angles and the parts of an angle, like the vertex.

Angles are measured in degrees (∘ ), which describe how spread apart intersecting lines or line segments are. Narrow spreads have small angle measures, while wide spreads have large …

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.

Courses Virginia Math Math: Pre-K - 8th grade Math: High school & college Math: Multiple grades Math: Illustrative Math-aligned Math: Eureka Math Squared-aligned Math: Eureka Math …

Thinking about a circle, a obtuse angle reaches almost 1/2 of the circle, but a diameter of the circle creates a straight angle (equals 180 degrees), and if you keep going on the circle, you …

Finding angle measures between intersecting lines Get 3 of 4 questions to level up!

Triangle angles Learn Angles in a triangle sum to 180° proof Triangle exterior angle example

When a third line, called a transversal, crosses these parallel lines, it creates angles. Some angles are equal, like vertical angles (opposite angles) and corresponding angles (same …