Important terms from Chapter One of the McGraw Hill Geometry Book
Terms : Hide Images
| 1530241751 | Acute angle | an angle that measures between 0 and 90 degrees, not inclusive | 0 | |
| 1530241752 | Adjacent angles | angles that share a common vertex and a common side | 1 | |
| 1530241753 | Angle bisector | a line, line segment or ray that goes through the vertex of an angle and divides it into two equal angles that are half the measure of the original angle | 2 | |
| 1530241754 | Area | how many squares are contained in something | 3 | |
| 1530241755 | Circumference | the distance around a circle | 4 | |
| 1530241756 | Collinear | points on the same line | 5 | |
| 1530241757 | Complementary angles | two angles whose measures total 90 degrees | 6 | |
| 1530241758 | Concave | a polygon with at least one diagonal in the exterior | 7 | |
| 1530241759 | Convex | a polygon whose diagonals are all in the interior | 8 | |
| 1530241760 | Cone | the 3-dimensional object with a circular base and diagonal sides coming to a point at the top. | 9 | |
| 1530241761 | Congruent | Equal in every way | 10 | |
| 1530241762 | Coplanar | things on the same plane | 11 | |
| 1530241763 | Cylinder | the 3-dimensional object with 2 circular bases and perpendicular lateral sides | 12 | |
| 1530241764 | Degree | angles are measured with a protractor in degrees | 13 | |
| 1530241765 | Edge | where 2 planes of a 3-dimensional object meet | 14 | |
| 1530241766 | Equilateral polygon | a polygon with congruent sides | 15 | |
| 1530241767 | Equiangular polygon | a polygon with congruent angles | 16 | |
| 1530241768 | Face | a plane that is part of a 3-dimensional object | 17 | |
| 1530241769 | Intersection | where 2 lines or planes meet | 18 | |
| 1530241770 | Line | one of the undefinable terms made up of points very close together. It is unmeasurable and has one dimension. | 19 | |
| 1530241771 | Line segment | it is a piece of a line with 2 endpoints. It can be measured and has one dimension. | 20 | |
| 1530241772 | Linear pair | 2 adjacent angles that are also supplementary | 21 | |
| 1530241773 | Midpoint | the point in the middle of a line segment | 22 | |
| 1530241774 | N-gon | represent a polygon with an unknown number of sides | 23 | |
| 1530241775 | Obtuse angle | an angle that measures between 90 and 180 degrees, not inclusive | 24 | |
| 1530241776 | Opposite rays | 2 rays pointing in opposite directions that make a straight angle measuring 180 degrees | 25 | |
| 1530241777 | Perimeter | the distance around a polygon found by the sum of the sides | 26 | |
| 1530241778 | Perpendicular | making a 90 degree angle | 27 | |
| 1530241779 | Plane | an undefinable term meaning a thin flat surface with 2 dimensions but unmeasureable | 28 | |
| 1530241780 | Platonic solid | a group of objects named for Plato containing all the same regular polygons. There are only 5. | 29 | |
| 1530241781 | Point | an undefinable term meaning a dot with no dimension and unmeasureable | 30 | |
| 1530241782 | Polygon | a shape that is closed, created by straight sides, and the sides don't cross each other. | 31 | |
| 1530241783 | Polyhedron | a 3-dimensional object made of polygons | 32 | |
| 1530241784 | Prism | a 3-dimensional box made of polygons with 2 congruent bases and lateral perpendicular sides that are usually rectangles | 33 | |
| 1530241785 | Pyramid | a 3-dimensional object made of a polygonal base with triangular lateral sides that come together in a point | 34 | |
| 1530241786 | Ray | a piece of a line with one endpoint that is immeasurable and has one dimension | 35 | |
| 1530241787 | Regular polygon | a polygon that is equilateral and equiangular | 36 | |
| 1530241788 | Right angle | an angle that measures exactly 90 degrees | 37 | |
| 1530241789 | Segment bisector | a line or point that divides a segment into 2 equal segments that are half the measure of the original segment | 38 | |
| 1530241790 | Sphere | a 3-dimensional perfect circle | 39 | |
| 1530241791 | Supplementary angles | 2 angles whose degrees add up to 180 | 40 | |
| 1530241792 | Surface area | the sum of the areas of all the faces of a 3-dimensional object | 41 | |
| 1530241793 | Undefined term | terms whose definitions are not easy to put into words - point, line, and plane | 42 | |
| 1530241794 | Vertex | the intersection of the 2 sides of an angle | 43 | |
| 1530241795 | Vertical angles | pairs of angles formed by 2 intersecting lines | 44 | |
| 1530241796 | Volume | the measurement of how many cubes contained in a 3-dimensional object | 45 |
