| A | B |
|---|
| acute triange (78) | A triangle whose largest angle measures less than 90°. |
| angle (23) | The opening that is formed when two lines, line segments, or rays intersect. |
| clockwise (75) | The same direction as the movement of a clock’s hands. |
| congruent (66) | Having the same size and shape. |
| counterclockwise (75) | The OPPOSITE direction as the movement of a clock’s hands. |
| decagon (63) | A polygon with ten sides. |
| flip (73) | Flipping a figure to produce a mirror image. |
| full turn (75) | A turn measuring 360°. |
| half turn (75) | A turn measuring 180°. |
| hexagon (63) | A polygon with six sides. |
| line of symmetry (79) | A line that divides a figure into two halves that are mirror images of each other |
| obtuse triange (78) | A triangle whose largest angle measures more than 90° and less than 180°. |
| octagon (63) | A polygon with eight sides. |
| orientation (73) | Position of a figure. |
| pentagon (63) | A polygon with five sides. |
| polygon (63) | A closed, flat shape with straight sides. |
| quadrilateral (63) | Any four-sided polygon. |
| quarter turn (75) | A turn measuring 90°. |
| reflection (73) | Flipping a figure to produce a mirror image. |
| regular polygon (63) | A polygon in which all sides have equal lengths and all angles have equal measures. |
| right angle (81) | An angle that forms a square corner and measures 90°. It is often marked with a small square. |
| right triange (78) | A triangle whose largest angle measures 90°. |
| rotation (73) | Turning a figure about a specified point called the center of rotation. |
| similar (66) | Having the same shape but not necessarily the same size. |
| straight angle (81) | An angle that measures 180° and thus forms a straight line. |
| symmetry (79) | Correspondence in size and shape on either side of a dividing line, |
| tessalation (82) | line. This type of symmetry is known as reflective symmet |
| transformations (73) | The repeated use of shapes to fill a flat surface without gaps or |
| translation (73) | Sliding a figure from one position to another without turning or flipping the figure. |
| triangle (63) | A polygon with three sides and three angles. |
| turn (73) | Rotation of a figure |
| vertex (63) | (Plural: vertices ) A point of an angle, polygon, or solid where two or more lines, rays, or segments meet. |
| isosceles triangle (78) | A triangle with at least two sides of equal length and two angles of equal measure. |
| oblique (23) | Slanted or sloping; not horizontal or vertical. |
| parallel lines (23) | Lines that stay the same distance apart; lines that do not cross. |
| scalene triangle (78) | A triangle with three sides of different lengths. |
| side (73) | A line segment that is part of a polygon. |
| Vertical (23) | Upright; perpendicular to horizontal. |
