| A | B |
|---|
| An * has 3 acute angles. | acute triangle |
| A * has 1 right angle. | right triangle |
| An * has 1 obtuse angle. | obtuse triangle |
| An * has 3 congruent sides and 3 congruent angles. | equilateral triangle |
| An * has at least 2 congruent sides and 2 congruent angles. | isosceles triangle |
| A * has no congruent sides and no congruent angles. | scalene triangle |
| The angle measures of a triangle in a plane add to *. | 180 degrees |
| A * is a closed plane figure formed by three or more segments. | polygon |
| All the sides and angles of a * have equal measures. | regular polygon |
| A * has exactly 1 pair of parallel sides. | trapezoid |
| A * has 2 pairs of parallel sides. | parallelogram |
| A * has 4 right angles. | rectangle |
| A * has 4 congruent sides. | rhombus |
| A * has 4 congruent sides and 4 right angles. | square |
| Triangle | 3 |
| Quadrilateral | 4 |
| Pentagon | 5 |
| Hexagon | 6 |
| Heptagon | 7 |
| Octagon | 8 |
| n-gon | n |
| A * names a location. | point |
| A * is perfectly straight and extends forever in both directions. | line |
| A plane is a perfectly flat surface that extends forever in all *. | directions |
| A * is the part of a line between two points. | segment |
| A ray is part of a line that starts at one * and extends forever in one direction. | point |
| What is formed by two rays with a common endpoint called the vertex? | angle |
| What are angles measured in? | degrees |
| A right angle measures * degrees. | 90 |
| An * angle measures less than 90 degrees. | acute |
| What angle measures greater than 90 degrees and less than 180 degrees? | obtuse angle |
| * angles have measures that add to 90 degrees. | Complementary |
| * angles have measures that add to 180 degrees. | Supplementary |
| What kind of figures have the same size and shape? | congruent |
| Intersecting lines form two pairs of * angles. | vertical |
