Transcript
Points, Lines, and Planes
Point
• a dot
• no size
• only location
Line • a straight line that goes on forever in both
directions
• can use any 2 points to name a line
• symbolized by
Collinear• points on the same line
Plane• a flat surface
• no thickness
Coplanar• points that are on the same plane
WHAT ARE THE UNDEFINED TERMS IN GEOMETRY?
point
line
plane
line segment• line that has endpoints (does not go on
forever
• symbolized by
Intersection of 2 Lines
• Is always a point
Intersection of two Planes
• Is always a line
Ray
•has 1 endpoint
•symbolized by
Opposite Rays
• two rays that have the same endpoint and go in opposite directions
Summary
• What does collinear mean?
• What does coplanar mean?
• What are the symbols for line, ray, and line segment?
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