Basic Geometric Elements Point Line Line segment Ray Parallel lines Intersecting lines Perpendicular Angles Vertex Sides

.A Geometry Point Line Line segment An exact location in space An endless collection of points along a straight path Line segment Part of a line that has two endpoints .A

Geometry Ray Part of a line that has one endpoint and extends endlessly in the other direction. .

Geometry Parallel Lines Intersecting Lines Perpendicular Lines Lines do not intersect but are in the same plane Intersecting Lines Lines meet at one point Perpendicular Lines Lines form a right angle

Angles An angle is formed when two rays have the same endpoint. This endpoint is called the vertex. The two rays that form the angle are called sides.

Angles There are four types of angles Right angle Straight angle Acute angle Obtuse angle

Right Angles Forms a square corner Forms a 90 degree angle. 90 degrees

Straight Angle Forms a straight line Angle is 180 degrees 180 degrees

Acute Angles Forms an angle that is less than a right angle Angle is less than 90 degrees

Obtuse Angles Form an angle that is more than a right angle Angle is more than 90 degrees