Chord -  A straight line with both endpoints on a circle.

Circle - A plane figure in which all the points are the same distance from  a point called the center.

Circumference - The distance around a circle.

Congruent Figures - Figures that have the same size and shape

Diagonal - A segment, other than a side, connecting two vertices of a polygon.

Diameter - A segment containing two points of a circle and the center.

Equilateral Triangle - A triangle with all 3 sides the same length and all angles the same measure.

Hexagon - A polygon with six sides.

Isosceles Triangle - A triangle with at least 2 sides the  same length and at least 2 angles the same measure.

Line of Symmetry - A line on which a figure can be folded  so that the two parts fit exactly.

Obtuse Angle - An angle with a measure greater than 90° and less than 180°.

Parallel Lines - Two lines  that  lie in the same plane and do not intersect.

Parallelogram - A quadrilateral with two pairs of parallel sides.

Pentagon - A polygon with 5 sides.

Perpendicular Lines - Two lines that intersect at right angles.

Polygon - A closed figure formed by line segments.

Quadrilateral - A polygon with four sides.

Radius-(plural, radii) - A line segment from the center of a circle to a point on the circle.

Rectangle - Quadrilateral with four right angles.

Rhombus - A quadrilateral with all sides the same length.

Right Angle - An angle that has a measure of 90°.

Scalene Triangle - A triangle with no sides the same length and no angles the same measure.

Symmetric Figure - A plain figure that can be folded in half so that the two halves match.

Trapezoid - A quadrilateral with only one pair of parallel sides.

Vertex - (plural, vertices)- The point that the two rays of an angle have in common.
 

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