Math Dictionary d
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Data : A collection of facts, such as values or measurements.
Decade : A period of 10 years.
Decahedron : A solid shape with ten flat faces.
Decimal : The base used for it is 10.
Decagon : A polygon with ten sides.
Deductive proof : A formal proof based on logical argument that is justified using axioms and/or theorems.
Deductive reasoning : A process of showing that certain statements follow logically from agreed upon assumptions and proven facts; reasoning from the general to the specific.
Diagonal : A line segment that connects two non-consecutive vertices of a polygon.
Diameter : A chord of the circle that passes through the center of the circle.
Diameter of a sphere : A line segment that connects two points on the surface of a sphere and that passes through the center of the sphere.
Dihedral angle: An angle formed by two interesting planes.
Dilation : A transformation of the plane such that if O is a fixed point, k is a non-zero real number, and P’ is the image of point P, then O, P and P’ are collinear and OP'/OP = k.
Direct transformation : Any transformation of the plane that preserves orientation.Examples: A translation, rotation or a dilation.
Distance between two points: The length of the line segment joining the two points; a unique non-negative real number.
Distance between a point and a line : The length of the perpendicular segment from the point to the line.
Distance between two parallel lines : The length of a line segment drawn from any point on one line perpendicular to the second line.
Dodecahedron : A polyhedron that has twelve faces. A regular dodecahedron is one of the five. Platonic solids and has twelve regular pentagons as faces.
Dynamic geometry software : Computer or calculator software used to construct and manipulate geometric figures.
Math dictionary d
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