| A | B |
|---|
| octagon | a polygon with eight sides |
| pentagon | a polygon with 5 sides |
| rhombus | a special parallelogram in which all sides are the same length |
| parallelogram | a quadrilateral with two pairs of parallel sides |
| triangle | a polygon with 3 sides |
| acute triangle | a triangle in which all three angles are acute angles |
| scalene triangle | a triangle in which no sides have the same length |
| equilateral triangle | a triangle having 3 sides of the same length |
| obtuse triangle | a triangle in which one angle is an obtuse angle |
| right angle | a triangle in which one angle is a right angle |
| isosceles triangle | a triangle with at least two sides having the same length |
| cone | a solid figure with a circle as its base and a curved surface that ends in a point called the vertex |
| side | a line segment that forms part of a polygon |
| cylinder | a solid figure with two congruent circles as bases |
| polygon | a closed figure made up of line segments |
| rectangular prism | a solid figure with faces that are rectangles |
| perpendicular lines | two lines, line segments, or rays that make a right angle |
| solid figure | a geometric figure that has length, width, and height |
| right angle | an angle that makes a square corner |
| pyramid | a solid figure whose base is a polygon and whose faces are triangles with a common point |
| obtuse angle | an angle that is open more than a right angle |
| cube | a solid figure with faces that are squares |
| acute angle | an angle that is open less than a right angle |
| line segment | a part of a line with two endpoints |
| face | a flat surface of a solid figure that does not roll |
| line | a set of points that forms an endless straight path in opposite directions |
| sphere | a solid figure in the shape of a ball |
| parallel lines | lines that never cross |
| vertex | a point where three or more edges of a solid figure meet |
| intersecting lines | lines that cross at one point |
| edge | a line segment where two faces of a solid figure meet |
| angle | two rays with the same endpoint; that endpoint is the vertex of the angle |
| point | an exact position, often marked by a dot |
| ray | a part of a line with only one endpoint |
| vertices | the plural form of vertex |
| square | a quadrilateral with four right angles and all sides the same length |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| rectangle | a quadrilateral with four right angles |
| vertex of a polygon | the point where two sides of a polygon meet |
| quadrilateral | a polygon with four sides |
| hexagon | a polygon with 6 sides |
