basic concepts and terms in geometry

• undefined terms are point, line, and plane
• congruent segment point; has no dimension usually represented by a small dot
• congruent segment point; has no dimension usually represented by a small dot
• line extends in one dimension
• line represented with straight line with two arrowheads to indicate that the line extends without end in 2 direction
• plane extends in 2 dimensions
• plane represented by a slanted 4 sided figure but you must envision it extends without end even through the representation has edges
• plane uses 3 of the points only when naming a plane