| A | B |
|---|
| face | flat surface of a solid that does not roll |
| edge | line segment where two faces of a solid meet |
| vertex (3-D solid figures) | the point where 3 or more edges of a solid meet |
| plane figure | a figure with only two dimensions |
| polygon | closed plane figure made of line segments |
| point | an exact location in space |
| line | straight path of points that goes on in two directions |
| line segment | a part of a line that has two endpoints |
| ray | a part of a line that has one endpoint that continues on and on in only one direction |
| angle | formed by two rays with a common endpoint |
| vertex (2-D plane figures) | the common endpoint of two rays |
| parallel lines | two lines that never intersect |
| intersecting lines | two lines that pass through the same point |
| perpendicular lines | two lines that intersect and form a right angle |
| trapezoid | quadrilateral with only one pair of parallel sides |
| parallelogram | quadrilateral with opposite sides that are parallel |
| rhombus | quadrilateral with opposite sides that are parallel and all sides are the same length |
| rectangle | quadrilateral with two pairs of parallel sides and four right angles |
| square | quadrilateral with 2 pairs of parallel sides and four right angle and all sides are the same length |
| side (2-D plane figure) | each line segment of a polygon |
| scalene triangle | triangle with all 3 sides of DIFFERENT lengths |
| equilateral triangle | triangle with all 3 sides of EQUAL length |
| isosceles triangle | triangle with exactly 2 sides of EQUAL length |
| right triangle | triangle with one angle of EXACTLY 90 degrees |
| acute triangle | triangle with all 3 angles of LESS than 90 degrees |
| obtuse triangle | triangle with one angle GREATER than 90 degrees |
