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### 27 Cards in this Set

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• Back
 a part of a line that has two endpoints line segment lines that lie in the same plane and do not intersect; they are always the same distance apart Parallel lines that meet or cross at a common point intersecting two lines or line segments that cross or meet to form right angles perpendicular an angle made when two line segments meet to form a square corner; it measure 90 degrees right angle part of a line that starts at an endpoint and goes on forever in one direction ray a figure that is formed by two rays with the same endpoint angle points common to the sides of an angle or two sides of a polygon vertex an angle that measures more than 90 degrees and less than 180 obtuse angle an angle that measures less than 90 degrees acute angle an angle that measures exactly 180 degrees; a straight angle forms a straight line straight line units for measuring angles or temperature degrees a device used to measure and draw angles protractor a simple closed plane figure made up of three or more line segments polygon a parallelogram with all four sides of the same length rhombus the line segments that make up a polygon sides a quadrilateral with only two parallel sides trapezoid a triangle that has three congruent sides equilateral triangle a triangle that has two congruent sides isosceles triangle a triangle with all sides of different lengths scalene triangle a triangle with one angle which measures 90 degrees right triangle a triangle with one obtuse angle obtuse triangle a triangle in which each of the three angles is acute acute triangle a point inside a circle at the exact middle center a segment that connects the center of a circle to any point on the circle radius a line segment that connects two points on the circle and passes through the center diameter a line segment that connects two points on a circle chord