Lines, Rays,

Segments and Angles What is a line? What is a line segment? What if there is only one end point? A line is a straight path that goes on FOREVER! A line segment is part of a line, but instead of continuing on forever, it has two endpoints. If there is only one end point, it is called a ray. Think of a ray like a flashlight. The light ray coming out of the flashlight goes on forever. The arrows at the ends let us know that the line goes on forever! What does a line segment look like? A B A Angles: Line segment AB and line segment CD intersect each other. Where they cross, they form angles. In this case, they form a right angle. When line segments meet at a right angle, the lines are said to be PERPENDICULAR to each other. A B C D This is a right angle: Right angles are angles that measure 90 degrees.They are marked by making a square in the corner of the angle. Other Angles This angle is called acute, because it is smaller than 90 degrees. This angle is called obtuse because it is larger than 90 degrees. What if the segments don't meet? If the lines never meet, they are called parallel lines. Think about lines on a piece of notebook paper. They never meet, so they are called parallel lines. What about shapes? This rectangle has 2 sets of parallel line segments.

This rectangle also has 4 right angles. One is shown, can you find the other 3? This triangle has 3 acute angles. It also has 3 segments that make up the edges. 60

Degrees 90 degrees 60

Degrees 60

Degrees

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# Lines, Rays, Segments and Angles

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