The math dictionary section bellow deals with all geometry terms starting with the letters 'C' and 'D'. As you can see we have a full
geometry dictionary available here for you to explore.
| Calculate: | Perform mathematical operations
|
 | Calculator: | A device used to perform mathematical operations |
 | Capacity: | The amount a container can hold |
 | Carroll diagram: | A sorting diagram named after Lewis Carroll |
 | Cartesian plane: | Also called the coordinate plane. Contains two perpendicular axes - X-Axis and Y-Axis. Points are plotted taking a position from both the x and y axis. eg (3,10) |
 | Chord: | A line segment connecting two point on a circles perimiter. |
 | Circle: | A plane shape drawn by a line whose points are equidistant from the centre point of the circle. |
 | Circumference: | The distance around the circle. Calculated by: C = 2.Pi.r |
| Clockwise: | The direction the hands on an anologue clock move. |
 | Closed Curve: | Any curve where it joins itself at its starting point. |
 | Cointerior angles: | The inner angles on the SAME side of a line drawn through parallel lines |
| Colinear: | When objects are situated on the same line. |
 | Colinear points: | Three or more points that lie on the same line. |
 | Compass (construction): | An instrument used to create circles. |
 | Complimentary angle: | Two angles whose sum EQUALS 90 degrees |
 | Concave: | Curved inwards. The opposite of convex. |
 | Concave quadrilateral: | A quadrilaterl with at least one reflex angle. |
 | Concave Polygon: | Any polygon with at least one reflex angle. |
 | Concentric Circle: | Circles different in size, but share a center point. |
 | Cone: | A solid shape composed of an circular or eliptical base, and a curved surface which tapers to a vertex. |
 | Congruent figures: | A congruent figure has all equal sides and all equal angles. |
 | Converging lines: | Lines that all head in the direction of the same point. |
 | Convex: | Curved outwards - the oposite of concave. |
 | Convex Quadrilaterals: | A quadrilateral where no angles are greater than 180 degrees (reflex) |
 | Coordinates: | Pairs of letters or numbers indicating a points position on the cartesian/coordinate plane. They are always indicated with the x-axis value first, then the y-axis. eg (4,7) |
| Coordinate plane: | Same as Cartesian Plane |
 | Coplanar: | Geometric objects that exist on the same plane. |
 | Corner: | The points where surfaces/vertices meet. |
 | Corresponding angles: | Angles that have the same position created by one line intersecting two or more paralell lines. |
| Counter Clockwise: | Same as anti clockwise. |
 | Cross Section: | The face that results when a solid shape is cut. |
 | Cube: | A solid shape whose form is created by 6 congruent squares. Also one of the 5 Platonic Solids. |
| Cubic: | The term used when describing a unit of volume. |
 | Cuboid: | A right prism created by six rectangular faces. If all faces are square it is called a cube. |
 | Curve: | A line that is NOT straight. |
 | Cyclic Quadrilaterals: | A quadrilateral where a circle can be circumscribed to contain all four vertices. |
 | Cylinder: | A solid shape composed of two congruent circles and one curved surface. |
| Deca: | Prefix meaning 10 |
 | Decagon: | A 10 sided polygon. |
 | Decahedron: | A Polyhedron with 10 faces. |
| Decrease: | To make smaller in size. |
| Deduct: | To subtract or take away. |
| Degree (angle): | The unit which angles are measured by. |
 | Diagonal: | A line joining two NON-adjacent vertices. |
 | Diameter: | A line connecting two points of a circle, which also includes the centre point of the circle. |
 | Diamond: | A plane shape with 4 equal sides and NO right angles. Also known as a Rhombus. |
 | Distance: | The length between two points or objects. |
| Divisible: | Can be divided without a remainder. |
| Dodeca: | Prefix for 12. |
 | Dodecagon: | A polygon with 12 straight edges. |
| Dodechedron: | A Polyhedron with 12 faces. |
