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Geometry and Constructions
AB
Polygon”closed plane figure formed by three or more line segments that do not cross.”
Regular Polygon“closed plane figure where all sides and angles are congruent.”
Similar Polygon“closed plane figures that have proportional corresponding sides and congruent corresponding angles.”
Congruent Polygon“closed plane figures with corresponding sides of the same length and corresponding angles of the same measure.”
Circle graph“graph that presents data as percents or fractions of a total.”
Tangent“line that intersects a circle at exactly one point.”
Secant“line that intersects a circle at two points.”
Transversal“line that intersects a set of lines.”
Protractor“measuring device that can be used to approximate the measure of an angle.”
Rhombus“parallelogram with four congruent sides.”
Arc“part of the curve of a circle.”
Inscribed Polygon“polygon whose sides are chord of a circle.”
Parallelogram“quadrilateral in which both pairs of opposite sides parallel.”
Trapezoid“quadrilateral with exactly one pair of parallel sides.”
Diagonal“segment joining two nonconsecutive vertices.”
Chord“segment that has both endpoints on the circle.”
Radius“segment that has one endpoint at the center and the other endpoint on the circle.”
Diameter“segment that passes through the center of a circle and has both endpoints on the circle.”
Circle“set of all points in a plane that are the same distance from a given point.”
Line“set of points that form a straight path extending infinitely in two directions.”
Central Angle“angle with its vertex at the center of a circle.”
Semicircle“arc that is exactly one-half of a circle.”
Compass“instrument used for drawing circles or arcs.”
Corresponding Angles“Angles in the same relative position in similar or congruent figures.”
Angle“Consist of two rays with a common endpoint.”
Congruent“Having exactly the same size and shape.”
Straight Angle“Measures exactly 180 degrees.”
Right Angle“Measures exactly 90 degrees.”
Acute Angle“Measures more than 0 degrees but less than 90 degrees.”
Obtuse Angle“Measures more than 90 degrees but less than 180 degrees.”
Vertical Angles“Non-adjacent angles formed by intersecting lines.”
Ray“Part of a line that consists of a point and all points on the line that extends in one direction.”
Segment“Part of a line that consists of two points on the line and all of the points on the line between them.”
Vertex“common endpoint of two rays that form an angle.”
Midpoint“point on a segment that divides
Alternate Interior“angles that are on opposite side of the transversal and on the inside of the given lines.”
Alternate Exterior“angles that are on opposite sides of the transversal and on the outside of the given lines.”
Triangle“three sided polygon.”
Bisect“to divide a line segment
Isosceles“Triangle with at least two congruent sides.”
Scalene“Triangle with no congruent sides.”
Obtuse Triangle“Triangle with one obtuse angle.”
Right Triangle“Triangle with one right angle.”
Acute Triangle“Triangle with three congruent angles.”
Equilateral Triangle“Triangle with three congruent sides.”
Adjacent Angles“Two angles that share a vertex and one side but have no common interior points.”
Supplementary Angles“Two angles whose sum equals 180 degrees.”
Complementary Angles“Two angles whose sum equals 90 degrees.”
Perpendicular“Two lines that intersect at right angles.”
Parallel“Two lines that lie in the same plane and do not intersect.”


Sheila Edwards

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