| A | B |
|---|
| point | an exact location |
| line | set of points that extends in opposite directions |
| line segment | part of a line with two endpoints |
| ray | part of a line with one endpoint |
| angle | formed by two rays with a common endpoint |
| vertex | the common endpoint of an angle |
| right angle | angle that measures exactly 90 |
| acute angle | has a measure of less than 90 |
| obtuse angle | has a measure of more than 90 |
| polygon | a closed plane figure made of line segments |
| congruent | the same |
| scalene triangle | triangle with no congruent sides |
| isosceles triangle | triangle with two congruent sides |
| equilateral triangle | triangle with all congruent sides |
| perimeter | distance around a polygon |
| chord | a line segment with its endpoints on the circle |
| diameter | chord that passes through the center |
| radius | line segment with an endpoint on circle & the other at center |
| circumference | the distance around a circle |
| parallel lines | lines that never meet |
