Geometry Lesson 1-4: Angles and Their Measures

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A set of vocabulary flashcards defining the parts, naming conventions, and classifications of angles based on the lesson notes.

Last updated 7:42 PM on 7/20/26
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10 Terms

1
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Angle

A figure formed by two noncollinear rays that meet at the same endpoint or vertex.

2
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Side

The rays that form an angle.

3
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Vertex

The shared endpoint where two rays meet to form an angle; it must be the middle letter when using three letters to name the angle.

4
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Right angle

An angle with a measure of 90 degrees

<p>An angle with a measure of 90 degrees</p>
5
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Acute angle

An angle with a measure less than 9090 degrees

<p>An angle with a measure less than $$90$$ degrees</p>
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Obtuse angle

An angle with a measure greater than 9090 but less than 180180 degrees

<p>An angle with a measure greater than $$90$$ but less than $$180$$ degrees</p>
7
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Congruent angles

Angles that have equal measures

<p>Angles that have equal measures</p>
8
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Protractor

A tool used to measure an angle to the nearest degree.

9
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Ray

The geometric parts that serve as the sides of an angle.

<p>The geometric parts that serve as the sides of an angle.</p>
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Degree

The unit of measurement used by a protractor to determine the size of an angle.