Lines+and+Angles+'08

Vocabulary

point - A point marks an exact location in space. Use a letter to name a point. line - A line is an endless straight path. It has no endpoints. Use two points on the line to name the line. ray - A ray is part of a line that has one endpoint and continues without end in one direction. Use an endpoint and one other point on the ray to name a ray. line segment - A line segment is part of a line that includes two endpoints and all of the points between them. Use the two endpoints to name the line segment. plane - A plane is a endless flat surface. Use three points that are not on a line to name the plane. angle - An angle is formed by two rays with the same endpoint. An angle can be named by three letters-a point from each side and the vertex as the middle letter. It can also be named by a single letter, its vertex. degree - Angles can be different sizes. The unit of measure for an angle is called a degree. parrallel lines - Lines in a plane that never intersect and are the samedistance apart at every point are parallel lines. intersecting lines - Lines that cross at one point are intersecting lines. perpendicular lines - Lines that intersect to form four right angles are perpendicular lines. media type="custom" key="3064668" media type="custom" key="3064532"