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Definition
| An angle with a degree measure with less than 90. |
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| A triangle in which all the angles are acute angles. |
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Definition
| Two angles that lie in the same plane, have a common vertex and a commmon side, but no common interior points. |
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| Arcs in a circle that have exactly one point in common. |
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Definition
| A proof that is made up of a series of algebraic statements. The properties of equality provide justification for many statements in algebraic proofs. |
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Definition
| The intersection of two noncollinear rays at a common endpoint. The rays are called sides and the common endpoint is called the vertex. |
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Definition
| A ray that divides an angle into two congruent angles. |
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Definition
| The angle between the line of sight and the horizontal when an observer looks downward. |
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Definition
| The angle between the line of sight and the horizontal when an observer looks upward. |
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Definition
| The angle through which a preimage is rotated to form the image. |
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Definition
| A segment that is drawn from the center of a regular polygon perpindicular to a side of the polygon. |
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Definition
| A part of a circle that is defined by two endpoints. |
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Definition
| The number of square units needed to cover a surface. |
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Definition
| An extra line of segment drawn in a figure to help complete a proof. |
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Term
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Definition
| A statement that is accepted as true. |
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Definition
| Symmetry in a 3D firgure that occurs if the figure can be mapped onto itself by a rotation between 0 and 360 degrees in a line. |
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Definition
| The intersection of the lateral faces and bases in a solid figure. |
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Definition
| Any side of a parallelogram. |
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Definition
| The two parallel congruent faces of a polyhedron. |
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Term
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Definition
| For any two points A and B on a line, there is another point C between A and B if and only if A, B, and C are collinear and AC + CB = AB. |
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Definition
| The conjunction of a conditional statement and its converse. |
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Term
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Definition
| The central point where radii form a locus of points called a circle. |
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Definition
| The center point from which dilations are performed. |
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Term
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Definition
| A fixed point around which shapes move in a circular motion to a new position. |
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Term
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Definition
| An angle that intersects a circle in two points and has its vertex at the very center of the circle. |
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Term
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Definition
| The distance around a circle. |
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Term
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Definition
| Points that lie on the same line. |
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Term
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Definition
| Two angles with measures that have a sum of 90 degrees. |
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Definition
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Definition
| Triangles that have their corresponding parts congruent. |
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Definition
| A method of creating geometric figures without the benefit of measuring tools. Generally, only a pencil, straightedge, and compass are used. |
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Term
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Definition
| Points that lie in the same plane. |
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Term
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Definition
| A line that connects to nodes in a network. |
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Term
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Definition
| A triangle with all angles congruent. |
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Term
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Definition
| An angle formed by one side of a triangle and the extension of another side. |
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Term
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Definition
| A flat surface of a polygon. |
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Term
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Definition
| A line that can be drawn through a plane figure so that the figure on one side is the reflection image of the figure on the opposite side. |
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Term
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Definition
| A pair of adjacent angles whose non-common sides are oppsite rays. |
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Term
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Definition
| The point on a segment exactly halfway between the endpoints of the segment. |
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Term
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Definition
| A polygon with n sides. For example a polygon with 15 side would be a 15gon. |
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Term
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Definition
| Coplaner lines that do not intersect. |
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Term
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Definition
| Planes that do not intersect. |
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Definition
| The sum of the lengths of the sides of a polygon. |
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Definition
| Lines that form right angles. |
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Definition
| A basic undefined term of geometry. A point is a location. In a figure, points are represented by a dot. Points are named by capital letters. |
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Definition
| A quadrilateral with four right angles. |
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Definition
| A convex polygon in which all of the sides and angles are congruent. |
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Term
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Definition
| A right prism with bases that are regular polygons. |
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Definition
| An angle with a degree measure of 90. |
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Definition
| Two angles with measures that have a sum of 180. |
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Term
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Definition
| Words, usually readily understood, that are not formally explained by means of more basic words and concepts. The basic undefined terms of geometry are point, line, and plane. |
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Term
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Definition
| Two nonadjacent angles formed by two intersecting lines. |
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