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| midpoint |
in geometry, the point that divides a line or arc into two equal lengths. [1/2 definitions] |
| minute1 |
in geometry, a unit of measure equal to one sixtieth of a degree of angle or arc. [1/6 definitions] |
| non-Euclidean |
of or designating any geometry not based on the postulates of Euclid. |
| plane1 |
in geometry, any surface so conformed that a straight line will join any two points within it. [1/7 definitions] |
| plane geometry |
the geometry of two-dimensional or planar figures. |
| Pythagorean theorem |
in geometry, the theorem that in a right triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides. |
| quadrivium |
in medieval universities, the higher section of the liberal arts, comprising arithmetic, geometry, astronomy, and music. (Cf. trivium.) |
| regular |
in geometry, having equal angles, sides, or faces. [1/12 definitions] |
| right |
in geometry, having the axis at a ninety-degree angle to the base. [1/28 definitions] |
| second2 |
in geometry, a unit of measure equal to one sixtieth of a minute of angle or arc. [1/3 definitions] |
| sector |
in geometry, a figure shaped like a piece of pie and determined by an arc of a circle and the two radii that intersect the endpoints of it. [1/4 definitions] |
| segment |
in geometry, a portion of a line bounded by two endpoints, or a part of a geometrical figure separated by a line or plane. [1/4 definitions] |
| solid geometry |
the branch of geometry dealing with three-dimensional figures and surfaces. |
| subtend |
in geometry, to extend across or under, or be opposite. |
| torus |
a semicircular surface, or rounded ridge, or the solid it encloses, such as the convex molding surrounding the base of a column or the doughnut-shaped figure generated, in geometry, by a circle or an ellipse. |
| trajectory |
in geometry, a curve or curved surface that intersects all of a given system of curves or surfaces at the same angle. [1/3 definitions] |
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