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# Angles

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In trigonometry, an angle is made up of either two rays with a common endpoint or two line segments with a common endpoint. The two rays or two line segments are known as the sides of the angle. The common endpoint is known as the vertex of the angle. We will learn about acute angles, which are angles that are less than 90°, right angles, which are exactly 90°, obtuse angles, which are between 90° and 180°, and lastly straight angles, which are exactly 180°. Lastly, we will learn about complementary angles, which are two positive angles that sum to 90° and supplementary angles, which are two positive angles that sum to 180°.

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Khan Academy - Video Khan Academy - Video Text Lessons:

Math Open Ref - Text Lesson Math is Fun - Text Lesson + Show More +