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Basic Geometric Ideas
PointAn exact location in space
LineAn endless collection of points along a straight path
Line segmentPart of a line that has two endpoints
.A
Geometry
RayPart of a line that has one endpoint and extends endlessly in the other direction
PlaneAn endless, flat surface that is named by any three points not on the same line.
.A.B .C
Geometry
Parallel LinesLines do not intersect but are in the same plane
Intersecting LinesLines meet at one point
Perpendicular LinesLines 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.
Right Angles
Forms a square corner
Forms a 90 degree angle.
Use a corner of your index card to make sure you a have a right angle
90 degrees
Straight Angle
Forms a straight line
Angle is 180 degrees
Use the edge of your index card to make sure you have a straight angle.
180 degrees