Geometry Terms From Chapter 1
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| 84413469 | acute angle | an angle less than 90 degrees but more than 0 degrees | 0 | |
| 84413470 | adjacent angles | are a pair of angles with a common vertex and a common side, but no common interior points | 1 | |
| 84413471 | angle | two non-collinear rays that have a common endpoint | 2 | |
| 84413472 | angle bisector | a ray that divides an angle into two congruent angles | 3 | |
| 84413473 | area | the number of square units needed to cover a surface | 4 | |
| 84413474 | bases | two parallel congruent faces | 5 | |
| 84413475 | between | when three points are collinear, you can say that one point is between the others | 6 | |
| 84413476 | circumference | the distance around a circle | 7 | |
| 84413477 | collinear | points that lie on the same line | 8 | |
| 84413478 | complementary angles | two angles whose measures have a sum of 90 degrees | 9 | |
| 84413479 | concave | curving inward | 10 | |
| 84413480 | cone | a circular base and a vertex | 11 | |
| 84413481 | congruent | the same measure | 12 | |
| 84413482 | construction | methods of creating geometric figures without the benefit of measuring tools | 13 | |
| 84413483 | convex | curving or bulging outward | 14 | |
| 84413484 | coplanar | lying in the same plane | 15 | |
| 84413485 | cylinder | a solid with congruent circular bases in a pair of parallel planes | 16 | |
| 84413486 | degree | a measure for arcs and angles | 17 | |
| 84413487 | edges | line segments where the faces intersect | 18 | |
| 84413488 | face | flat surface | 19 | |
| 84413489 | line | made up of points and has no thickness or width | 20 | |
| 84413490 | linear pair | a pair of adjacent angles with non-common sides that are opposite rays | 21 | |
| 84413491 | line segment | a part of a line with two endpoints; can be measured | 22 | |
| 84413492 | midpoint | the point on the segment that divides the segment into two congruent segments | 23 | |
| 84413493 | obtuse angle | an angle between 90 and 180 degrees | 24 | |
| 84413494 | opposite rays | two rays that have the same endpoint and travel indefinitely in opposite directions forming a line | 25 | |
| 84413495 | perimeter | the size of something as given by the distance around it | 26 | |
| 84413496 | perpendicular | lines, segments, or rays that form right angles | 27 | |
| 84413497 | plane | a flat surface made up of points | 28 | |
| 84413498 | point | a location | 29 | |
| 84413499 | polygon | a closed plane figure bounded by straight sides | 30 | |
| 84413500 | polyhedron | a solid figure bounded by plane polygons or faces | 31 | |
| 84413501 | prism | a polyhedron with two congruent and parallel faces and whose lateral faces are parallelograms | 32 | |
| 84413502 | pyramid | a polyhedron having a polygonal base and triangular sides with a common vertex | 33 | |
| 84413503 | ray | a part of a line that has one endpoint and extends indefinitely in one direction | 34 | |
| 84413504 | right angle | an angle that measures exactly 90 degrees | 35 | |
| 84413505 | segment bisector | any segment, line, or plane that intersects a segment at its midpoint | 36 | |
| 84413506 | sides | the rays of an angle | 37 | |
| 84413507 | space | a boundless, three-dimensional set of all points that contains lines and planes | 38 | |
| 84413508 | sphere | a three-dimensional closed surface where every point on the surface is equidistant from the center | 39 | |
| 84413509 | supplementary angles | two angles whose measures have a sum of 180 degrees | 40 | |
| 84413510 | undefined term | a point, line, or plane because they can only be explained using examples and descriptions | 41 | |
| 84413511 | vertex | the common endpoint in an angle | 42 | |
| 84413512 | vertical angles | two nonadjacent angles formed by two intersecting lines | 43 |
