Geometry Unit 1 Vocabulary

Two coplanar lines that never intersect

• Parallel Lines

• Perpendicular Lines

• Collinear

• Coplanar

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CCSS.HSG.CO.A.1

An angle less than 90°

• acute angle

• obtuse angle

• right angle

• straight angle

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A flat surface with two dimensions: length and width

• plane

• coplanar

• vertex

• collinear

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A 90° angle

• right angle

• acute angle

• obtuse angle

• straight angle

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Found on the same plane

• vertex

• collinear

• coplanar

• intersection

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CCSS.HSG.CO.A.1

Found on the same line

• point

• vertex

• coplanar

• collinear

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CCSS.HSG.CO.A.1

A figure comprised of two rays and a common endpoint

• plane

• angle

• line

• vertex

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CCSS.4.G.A.1

An angle greater than 90° but less than 180°

• acute angle

• right angle

• obtuse angle

• straight angle

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Lines that meet at 90° angles

• right angle

• perpendicular lines

• parallel lines

• collinear

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

The point at which the rays of an angle meet

• acute angle

• vertex

• sides

• degrees

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CCSS.HSG.CO.A.1