Geometry Vocabulary Essentials

This video tutorial introduces essential geometry vocabulary, including points, lines, line segments, rays, planes, and angles. It explains the characteristics and definitions of each term, discusses different types of angles, and covers the angle addition postulate with examples.

What is a point in geometry?

• A dot labeled with a capital letter

• A line with two endpoints

• A shape with volume

• A plane with three points

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How is a line segment different from a line?

• A line segment is labeled with a lowercase letter

• A line segment has two endpoints

• A line segment extends infinitely

• A line segment is a three-dimensional figure

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CCSS.HSG.CO.A.1

What is a ray in geometry?

• A line with two endpoints

• A portion of a line that starts at a point and extends infinitely in one direction

• A three-dimensional figure

• A line that stops at a point

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How can a plane be defined?

• By listing any two points on it

• By listing any three points on it which are not on a line

• By listing any five points on it

• By listing any four points on it

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CCSS.HSG.CO.A.1

What is the vertex of an angle?

• The point where two rays meet

• The point where a line segment ends

• The point where a line intersects a plane

• The point where a plane starts

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CCSS.HSG.CO.A.1

How can an angle be named?

• By its endpoint

• By its length

• By its midpoint

• By its vertex

What is an acute angle?

• An angle exactly 180 degrees

• An angle greater than 0 degrees and less than 90 degrees

• An angle exactly 90 degrees

• An angle greater than 90 degrees and less than 180 degrees

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CCSS.4.G.A.1

Which of the following is an obtuse angle?

• 45 degrees

• 90 degrees

• 135 degrees

• 180 degrees

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CCSS.4.G.A.1

What is a straight angle?

• An angle that measures more than 180 degrees

• An angle that measures exactly 90 degrees

• An angle that measures exactly 180 degrees

• An angle that measures less than 90 degrees

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CCSS.4.G.A.1

According to the angle addition postulate, if angle QTR is 25 degrees and angle RTV is 52 degrees, what is the measure of angle QTV?

• 100 degrees

• 77 degrees

• 52 degrees

• 25 degrees

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