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Circle- A round, 2 dimensional shape without any corners or edges.

Circle graph- A graph which it’s interior are divided into parts to show the parts of a set of data. The whole circle represents the whole set of data.

Circumference- The distance around a circle or sphere.

Common denominator- Any number except zero, which is multiple of the denominator of two or more fractions.

Common factor- A number that is a factor or two or more numbers.

Composite numbers- A number that has more than two factors.

Concave polygons- A polygon that has at least one "caved in side.”

Cone- A 3-dimensional shape that has a circular bace, a curved surface and one vertex which is called an apex.

Congruent- Same shape or size.

Coordinate grid- A grid with 4 equal areas, 1 all negative numbers, 1 all positive numbers, and 2 negative and positive numbers, which can help locate points on a grid. These grids are made with the 2 number lines (negative and positive).