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Circle
A closed curve in a plane where all points are equally distant from a fixed point called the center.
Circumference
The perimeter of a circle.
Semicircle
One half of a circle.
Diameter
A line through the center with its ends on the circle.
Radius
A line joining the center with any point on the circle.
Chord
Any straight line whose ends are on the circle.
Arc
Any portion of a circle.
Quadrant
The arc which represents a quarter of a circle.
Congruence
Two plane figures are congruent if they have the same size and shape.
Corresponding parts
The angles and sides that match.
Axiom
A general statement accepted without proof to be true.
Postulate
A geometric assumption accepted without proof to be true.
Proof
The process of deductive reasoning whereby the truth of a theorem or correctness of a construction is established.
Given
A statement of beginning facts.
Prove
What is to be shown true.
Analysis
Planning and reasoning to discover how to solve a proof.
Proof
Logically arranged steps leading to the conclusion.
Corollary
Another geometric statement that is easily deduced from the given theorem.
Note
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