Download Geometry Vocabulary

Geometry Vocabulary From the “I have…. Who has….?” Game Angle Bisector -­‐ A ray that divides an angle into two congruent parts Median -­‐ A segment from a vertex of a triangle to the midpoint of the opposite side Altitude -­‐ A perpendicular segment from a vertex of a triangle to the opposite side Equilateral Triangle -­‐ A triangle with three congruent sides Complementary Angles -­‐ Two angles whose sum is 90 degrees Midpoint -­‐ A point that divides a segment into two congruent parts Right Angle -­‐ An angle whose measure is 90 degrees Bisect -­‐ To divide a segment or an angle into two congruent parts Isosceles Triangle -­‐ A triangle in which at least two sides are congruent Concurrent Lines -­‐ Three or more lines that meet or intersect at one point Ray -­‐ A straight set of points that begins at an endpoint and extends infinitely in one direction Supplementary Angles -­‐ Two angles whose sum is 180 degrees Scalene Triangle -­‐ A triangle in which no two sides are congruent Parallel Lines -­‐ Coplanar lines that do not intersect Collinear Points -­‐ Three or more points that are on the same line Straight Angle -­‐ An angle whose measure is 180 degrees Trisect -­‐ To divide a segment or angle into three congruent parts Transversal -­‐ A line that intersects two coplanar lines in two distinct points Linear Pair -­‐ A pair of adjacent angles that form a straight line Right Triangle -­‐ A triangle in which one of the angles measures 90 degrees Quadrilateral -­‐ A four-­‐sided polygon Vertex -­‐ The common endpoint of two sides of a polygon Acute Triangle -­‐ A triangle in which all three angles are between 0 and 90 degrees Diagonal -­‐ A segment that joins two nonconsecutive vertices of a polygon Perpendicular Bisector -­‐ A line that bisects and is perpendicular to a segment