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Geometry Vocabulary
geometry terms
| Answer | Question |
|---|---|
| Acute Angle | An angle with a measure greater than 0 degrees but less than 90 degrees. |
| Acute Triangle | A triangle with three acute angles |
| Angle | Two rays that share an endpoint (vertex) |
| Area | The amount of surface in a region or enclosed within a boundary. |
| Circle | A closed curve with all points an equal distance from the center |
| Circumference | The distance around the outside of a circle. |
| Cone | A three-dimensional figure with a circular base joined to a vertex by a curved surface. |
| Congruent | Having exactly the same size and shape. |
| Cube | A solid figure in which every face is a square and every edge is the same length. |
| Decagon | A polygon with ten sides. |
| Diameter | A line segment that cuts a circle in half. |
| Endpoint | The point(s) at the end of a ray or line segment. |
| Equilateral Triangle | A triangle with three congruent sides. Each angle measures 60 degrees. |
| Flip | another word for REFLECTION |
| Geometry | The branch of mathematics that deals with the position, size, and shape of figures. |
| Hemisphere | Half of a sphere |
| Heptagon | A polygon with seven sides. |
| Hexagon | A polygon with six sides. |
| Isosceles Triangle | A triangle with at least two congruent sides and two congruent angles. |
| Kite | A convex quadrilateral with two distinct pairs of adjacent, congruent sides. |
| Line | A set of points that form a straight path extending infinitely in two directions. |
| Line of Symmetry | A line dividing a two-dimensional figure into two parts that are mirror images of each other. |
| Line Segment | A part of a line. A line segment has two endpoints and a definite length. |
| Nonagon | A polygon with nine sides. |
| Obtuse Angle | An angle that is greater than 90 degrees but less than 180 degrees |
| Obtuse Triangle | A triangle that has one obtuse angle. |
| Octagon | A polygon with eight sides. |
| Parallel Lines | Lines lying in the same plane that are always the same distance apart. |
| Parallelogram | A quadrilateral with both pairs of opposite sides parallel. Opposite angles are congruent. |
| Pentagon | A polygon with five sides. |
| Perimeter | The distance around a figure. |
| Perpendicular | At right angles. |
| Plane | A flat surface extending infinitely in all directions. |
| Point | The smallest geometric unit. A position in space, often represented by a dot. |
| Polygon | A simple, closed, plane figure bounded by straight sides. |
| Quadrilateral | A polygon with four sides. |
| Ray | A set of points that form a straight path extending infinitely in one direction. A ray has one endpoint. |
| Rectangle | A parallelogram with four right angles. Opposite sides are congruent and parallel. |
| Reflection | A transformation of a geometric figure that results in a mirror image of the original. |
| Regular Polygon | A polygon that has equal sides and equal angles. |
| Rhombus | A parallelogram with four congruent sides. Opposite angles are congruent. |
| Right Angle | An angle that is one-fourth of a full turn. A right angle measures 90 degrees. |
| Right Triangle | A triangle that has one right angle. |
| Scalene Triangle | A triangle with no sides congruent. |
| Similar Figures | that have the same shape but not necessarily the same size. |
| Slide | another word for TRANSLATION |
| Sphere | A three-dimensional figure formed by a set of points that are all the same distance from a fixed point called the center. |
| Square | A rectangle with congruent sides. |
| Symmetry | If a figure can be folded along a line so that the two halves match exactly, then the figure has line symmetry. |
| Three-Dimensional | Relating to objects that have length, width, and depth. Solid figures such as polyhedra, cones, and spheres are three-dimensional. |
| Translation | A transformation in which a geometric figure is formed by moving every point on a figure the same distance in the same direction. |
| Trapezoid | A quadrilateral with exactly one pair of parallel sides. |
| Triangle | A polygon with three sides. |
| Triangular Prism | A prism in which the bases are triangles. |
| Two-Dimensional | Relating to figures that have length and width but not depth. Figures such as polygons and circles are two-dimensional. |
| Vertex | A point at which two line segments, lines, or rays meet to form an angle. |
Created by:
MrLittle5
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