one letter at the vertex; or
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A chord is a line segment connecting any two points on a circle. A chord may or may not go through the center of a circle. The diameter is the longest chord of a circle.
A vertex is a point at which two or more lines, line segments, or rays meet to form an angle. In solid figures a vertex is the point at which three or more edges meet.
A ray is part of a line. It has one endpoint and extends indefinitely in one direction.
Solve addition and subtraction problems to find unknown angle measures on a diagram in practical and mathematical problems, (e.g., by using an equation with a symbol for the unknown angle measure).
An angle is formed by two rays that share a common endpoint called the vertex. Angles are found wherever lines or line segments intersect.