| A | B |
|---|
| right angle | A 90 degree angle. |
| equilateral triangle | A triangle with all sides equal. |
| scalene triangle | A triangle with three unequal sides and angles. |
| vertex | Corner |
| right triangled triangle | A triangle with one internal angle equal to 90 degrees. |
| pentagon | A polygon with 5 sides and 5 angles. |
| square | A quadrilateral with 4 equal sides and 4 right angles. |
| intersecting lines | Lines that cross each other. |
| perpendicular lines | Lines that cross each other to form a 90 degree angle. |
| acute angle | An angle less than 90 degrees. |
| chord | The line segment between two points on a given curve. |
| radius | A straight line extending from the center of a circle to the circumference. |
| line segment | One part of a line. |
| point | A position in space. |
| rectangle | A quadrilateral with opposite sides parallel and 4 right angles. |
| hexagon | A six sided polygon |
| obtuse angle | An angle greater than 90 degrees. |
| reflex angle | An angle greater than 180 degrees. |
| parallelogram | a quadrilateral whose opposite sides are parallel |
| rhombus | a quadrilateral with 4 equal sides and whose opposite sides are parallel |
| kite | a quadrilateral with 2 pairs of equal and adjacent sides |
| octagon | An 8 sided polygon |
| decagon | A 10 sided polygon |
| nonagon | A 9 sided polygon |
| heptagon | A 7 sided polygon |
