| Term | Definition |
|---|
| Intersecting Lines | lines that cross |
| Oblique Lines | slanted or sloping;not horizontal or vertical |
| Parallel Lines | lines that stay the same distance and a part lines that do not cross |
| Perpendicular Lines | two lines that intersect at right angles |
| Acute Angle | an angle whose measure is more than 0 degrees and less than 90 degrees |
| Congurant | having the same shape or size |
| Obtuse Angle | a tringle whose largest angle measures more than 90 degrees and less than 180 degrees |
| Plane | a flat surface that has no boundaries |
| Polygon | a closed, flat shape with straight sides |
| Quadrilateral | any four-sided polygon |
| Right Angle | an angle that forms a square corner and measures 90 degrees.It is often marked with a small square |
| Straight Angle | an angle that measures 180 degrees and thus forms a straight line |
| Vertex | a point of an angle,polygon,or solid where two or more lines or lines segments meet |
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