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| acute |
in geometry, of less than ninety degrees. [1/7 definitions] |
| altitude |
in geometry, a perpendicular line segment that extends from one vertex of a figure to the opposite edge or face, or the length of such a line segment; height. [1/4 definitions] |
| analytic geometry |
a branch of geometry that uses algebraic equations to determine distance or the like by using variables defined by coordinates; Cartesian geometry. |
| circumcenter |
in geometry, the center of a circumscribed circle, which is a circle is that touches all the vertices of a polygon. |
| complement |
in geometry, the difference between a right angle and a given angle that is less than ninety degrees. [1/7 definitions] |
| cone |
in geometry, a three-dimensional shape created by rotating a right triangle 360 degrees on its vertical axis. [1/5 definitions] |
| congruent |
in geometry, exactly the same in shape and size. [1/2 definitions] |
| conic section |
in geometry, a curve, such as an ellipse, hyperbola, or parabola, created by the intersection of a plane and a right circular cone. |
| conoid |
in geometry, a solid formed by the revolution of a conic section around its axis. [1/3 definitions] |
| cusp |
in geometry and architecture, the point at which two curves become tangent. [1/3 definitions] |
| cycloid |
in geometry, a curve traced by a point on the circumference of a circle that is rolling along a straight line. [1/3 definitions] |
| cylinder |
in geometry, a surface or volume described by a straight line tracing a closed curve, esp. a circle, at a fixed angle, usu. a right angle, in two parallel planes. [1/5 definitions] |
| decagon |
in geometry, a ten-sided plane figure. |
| decahedron |
in geometry, a ten-faced solid figure. |
| diameter |
in geometry, a straight line passing through the center of a circle or sphere and having its ends on the circumference or surface. [1/3 definitions] |
| epicycle |
in geometry, a small circle that rolls on the inside or the outside of the circumference of a larger circle. [1/2 definitions] |
| erect |
in geometry, to draw (a figure) upon a defined line or other base. [1/7 definitions] |
| geometric |
having to do with geometry. [2 definitions] |
| geometry |
the area of mathematics concerned with the study of shapes and objects. Geometry deals with the measurement and relation of angles, points, lines, planes, and solid figures. [1/2 definitions] |
| mathematics |
(used with a singular verb) the study of numbers, amounts, shapes, and the relationship between them, using symbols to represent these things. Arithmetic, algebra, and geometry are some branches of mathematics. |
| mensuration |
the branch of geometry concerned with measuring length, area, and volume. [1/2 definitions] |
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