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## LINES, RAYS, AND PLANES

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**LINES, RAYS,**AND PLANES**Lines, rays and planes are all around us. Let’s look at**each one and see if we can find examples in our environment.**LINES**What are lines? Lines are long, thin continuous marks.**We name and identify lines by using points on the lines.**A F AF H G GH**There are 3 main types of lines.**PARALLEL LINES PERPENDICULAR LINES INTERSECTING LINES**PARALLEL**LINES What are parallel lines? Parallel lines are always the same distance apart and never touch.**Can you name parallel lines in the diagram below?**A B E C D F AG and BH CE and DF H G**PERPENDICULAR**LINES What are perpendicular lines? Perpendicular lines are lines that intersect (cross) and make 4 right angles.**Can you name perpendicular lines in the diagram below?**A B C D E AF and BC AF and DE F**INTERSECTING**LINES What are intersecting lines? Intersecting lines cross one another but never form right angles. Intersecting lines can resemble an ‘X’.**Can you name intersecting lines in the diagram below?**B A C CD and AE CD and BF F E D**RAYS**What are rays? Rays are lines that have a definite starting point but no end. Rays continue on endlessly in one direction.**Can you name any rays in the diagram below?**A B C D E F FA and ED**PLANE**What is a plane?(We are not talking about the one that flys in the sky). A plane is a flat surface. It is named by at least 3 points. A C This is plane ABC. B**Look around the classroom. Do you see any planes?**Chalkboard Door Window Top of Desk Book Cover Floor Wall Paper Ceiling Dry Erase Boards