| A | B |
|---|
| Parallelogram | a quadrilateral with both pairs of opposite sides parallel |
| Rectangle | a parallelogram that has 4 right angles |
| Square | a rectangle with 4 sides of the same length |
| Rhombus | a parallelogram with congruent sides |
| Line of symetry | divides a figure in half with two halves that match each other EXACTLY |
| Congruent | same size & shape |
| Diagonals | line segment that connects 2 corners of a figure & is not a side |
| Ray | a part of a line that has 1 endpoint & goes on forever in one direction |
| Angle | a figure formed by 2 rays or 2 line segments that meet at an endpoint |
| Right angle | a triangle with 1 right angle |
| Acute angle | an angle whose measure is less than 90 degrees |
| Obtuse angle | an angle that measures more than 90 degrees but less than 180 degrees |
| Equilateral triangle | a triangle whose sides are all the same length |
| Isosceles triangle | a triangle that has at least 2 sides of the same length |
| Scalene triangle | a triangle with sides of 3 different lengths |
| Degree | a unit for measuring angles or temperature |
| Straight angle | an angle that measures 180 degrees |
| Right angle | an angle that measures 90 degrees |
