| A | B |
|---|
| Acute angle | an angle whose measure is less than 90* |
| Angle | corner formed by the intersection of two line segments, rays, or lines |
| Angle bisector | a straight line that divides an angle into two equal parts |
| Arc | any part of a curve, especially a circle |
| Base | the line or plane upon which a geometric figure is thought of as resting |
| Chord | a straight line segment joining any two points on a circle |
| Circumference | the line bounding a circle |
| Diameter | a line segment passing through the center of a circle |
| Hypotenuse | the longest side of a right triangle, located opposite the right angle |
| Intersecting lines | lines that cross each other |
| Line | continuously connected points extending to infinity |
| Line segment | continuously connected points with a disstinct start and finish |
| Obtuse angle | an angle whose measure is greater than 90* |
| Parallel lines | lines that extend in the same direction and at the same distance apart at every point so as never to meet |
| Perpendicular lines | lines that are at right angles t each other; the intersection of these lines forms right angles |
| Point | an element that has a definate position but no size, shape, or extension |
| Radius | any straight line ext3ending from the center to the edge of a circle |
| Ray | continuously connected points extending in one direction from a fixed point |
| Right angle | an angle whose measure is exactly 90* |
| Tangent | a line that touches, but does not intersect a curve or curved surface at one and only one point |
