geometry basics Flashcards
What is a line/what are lines?
A path that extends in opposite directions with infinite points
What is a point/what are points?
A location of something (no size)
What is a plane?
A flat surface that extends (has no end and contains infinite lines)
What is a segment/what are segments?
“Part of a line that has two endpoints and all points between them”
What is a ray/what are rays?
“Part of a line with one endpoint and all points on one side of the endpoint”
What are opposite rays?
“Two rays that have the same endpoint and form a line”
What is postulate 1-1?
“Through any two points there is exactly one line”
What is postulate 1-2?
“If two distinct lines intersect, then they intersect in exactly one point”
What is postulate 1-3?
“If two distinct planes intersect, then they intersect in exactly one line”
What is postulate 1-4?
“Through any three non-collinear points there is exactly one plane”
