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5 th Grade Geometry Lines & Angles Lauri Hagie IDT 503 Final Project

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Lines Lines have arrows on each end. Lines do not end; they go on and on forever in both directions.

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Line Segments Line segments may also be called segments. Line segments are part of a line. Line segments do not have arrows.

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Rays Rays begin with a point at one end. Rays go on and on forever in only one direction. Rays have an arrow on one end.

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Horizontal Lines, segments, and rays may be drawn horizontally. Horizontal means level with the horizon. The horizon is the line in the distance where the land and the sky meet. Horizontal Line Horizontal Segment Horizontal Rays

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Vertical Lines, segments, and rays may be drawn vertically. Vertical means straight up and down. Vertical Line Vertical Segment Vertical Rays

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Oblique Lines, segments, and rays may be oblique. Oblique means slanted. Oblique Segment Oblique Rays Oblique Line

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Parallel Lines, segments, and rays may be parallel. Parallel lines go in the same direction and will never cross over each other. Parallel lines can be horizontal, vertical or oblique. Parallel, Horizontal Segments Parallel, Vertical Rays Parallel, Oblique Lines

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Intersecting Lines, segments, and rays may cross over each other. We call this intersecting. Intersecting Segments Intersecting Rays Intersecting Lines

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Perpendicular Lines, segments, and rays may be perpendicular. When lines intersect and form square corners, we call them perpendicular. Perpendicular Segments Perpendicular Rays Perpendicular Lines

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Angles Angles form when lines, segments, or rays intersect. There are 3 types of angles: –Acute –Right –Obtuse

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Right Angles Right angles are 90 They form square corners.

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Acute Angles Acute angles are less than 90 “A cute” little angle.

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Obtuse Angles Obtuse angles are greater than 90

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Quiz Time! Name this figure: LineSegmentRay

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Correct! Way to go, You are right!

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Sorry… Your answer was not correct. Try again.

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Quiz Time! Name this figure: Horizontal VerticalOblique

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Correct! Way to go, You are right!

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Sorry… Your answer was not correct. Try again.

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Quiz Time! Name this figure: ParallelPerpendicular

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Correct! Way to go, You are right!

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Sorry… Your answer was not correct. Try again.

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Quiz Time! Name this figure: AcuteRightObtuse

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Correct! Way to go, You are right!

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Sorry… Your answer was not correct. Try again.

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The End You are now a 5 th grade expert in geometry! Hake, S., & Saxon, J. (2001) Math 65: an incremental development, 2 nd edition. Norman, OK: Saxon Publishers, Inc.

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