| A | B |
|---|
right angle,  | A 90 degree angle. |
equilateral triangle,  | A triangle with all sides equal. |
scalene triangle,  | A triangle having three unequal sides and angles. |
| vertex | The intersection point of two sides. |
right triangle,  | A triangle with one internal angle equal to 90 degrees. |
pentagon,  | A polygon with 5 sides and 5 angles. |
square,  | A rectangle having all four sides of equal length. |
intersecting lines,  | Lines that cross each other. |
perpendicular lines,  | Two lines that cross each other to form a 90 degree angle. |
acute angle,  | An angle less than 90 degrees. |
| line segment | One part of a line. |
| Line | A continuous extent of length. |
| rectangle | A quadrilateral with opposite sides parallel. |
hexagon,  | A six sided figure |
| obtuse angle | An angle greater than 90 degrees. |
| isosceles triangle, | A triangle with TWO equal sides |
| parallelogram | opposite sides of a parallelogram are parallel and are the same length |
| octagon | a polygon with eight sides |
regular polygon,  | have sides that are the SAME length |
| protractor | tool to measure angles sizes |
