Circle Graph

Circle in a Cartesian Plane

Circle in a Geometric Plane

Circuit

Circular Function

Circular Sector

Circular Segment

Circular System

Circular Trigonometry

Circumference

Circumference of a Circle

Circumference of a Sphere

Circumscribed Circle of a Polygon

Class

Classification

Claudius Ptolemy (C. 85 – C. 165)

Closed Curve

Closed Graph

Closed Plane Surface

Cluster

Coefficient

Coefficient of a Monomial

Coefficient of Determination

Coefficient of Linear Correlation

Coefficient of Proportionality

Coefficient of Variation of a Population (Statistics)

Cofunction

Collinear Points

Collinear Vectors

Cologarithm

Column

Column Matrix

Combination

Combinatorics

Common Denominator

Common Logarithm of a Number

Commutative Operation

Commutative Property

Comparison

Compass

Compatible Events

Compatible Matrices

Compilation Table

Complement of a Set

Complementary Angles

Complementary Events

Complementary Graph

Complete Graph

Complex Fraction

Complex Number

Composite Event

Composite Number

Composition of Functions

Compound Interest

concave

Concave Polygon

Concave Quadrilateral

Concavity

Concentric

Concentric Circles

Concurrent Lines

Conditional

Conditional Probability

Cone

Cone of Revolution

Confidence Interval

Congruence of Geometric Figures

Congruence of Numbers

Congruent

Congruent Angles

Congruent Figures

Congruent Line Segments

Congruent Numbers Modulo N

Congruent Polygons

Congruent Sides

Congruent Triangles

Conic Section

Conical Perspective

Conical Surface

Conjecture

Conjugate Axis

Conjunction

Connected Graph

Connected Relation

Connector

Consecutive

Consecutive Whole Numbers

Consequence

Constant

Constant Function

Constant Term

Constraint

Continuous Function

Continuous Random Variable

Contraction

Contradiction

Contraposition

Convergent Sequence

Convex

Convex Polygon