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Mathematics
Of or pertaining to the study of the measurement, properties, and relationships of quantities and sets, using numbers and symbols.
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Mathematics > Geometry 
semicircles
Mathematics; Geometry
The two arcs of a circle that are cut off by a diameter. The measure of a semicircle is 180.
pie graph
Mathematics; Geometry
A circle marked into sectors. Each sector shows the fraction represented by one category of data. Pie graphs are also called circle graphs.
octahedron
Mathematics; Geometry
A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
opposite angles
Mathematics; Geometry
In a quadrilateral, angles that do not have a common side--that is, non-adjacent angles.
line of symmetry
Mathematics; Geometry
A line dividing a two-dimensional figure into two parts that are mirror images of each other.
Sub-categories
- Algebra (7603)
- Analysis (88)
- Calculus (3452)
- Cryptography (47)
- General mathematics (91)
- Geometry (11000)
- Measurements (847)
- Number theory (1128)
- Theorem (241)
- Trigonometry (598)