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### 34 Cards in this Set

• Front
• Back
 an exact location point a straight path that extends without end in opposite directions line a flat surface that extends without end in all directions plane made up of two endpoints and all the points between the endpoints line segment has one endpoint. From the endpoint, it extends without end in one direction only ray measures less than 90 degrees acute angle measures 90 degrees right angle measures more than 90 degrees and less than 180 degrees obtuse angle the common endpoint of two rays vertex a triangle with all angles measuring less than 90 degrees acute triangle a triangle containing one obtuse angle obtuse triangle a triangle containing one right angle right triangle a triangle with no congruent sides scalene triangle a triangle with at least two congruent sides isosceles triangle a triangle with three congruent sides equilateral triangle a four sided polygon, or a plane with four sides and four angles quadrilateral a figure formed by two rays with a common endpoint called the vertex angle a quadrilateral with two pairs of parallel sides parallelogram a parallelogram with four right angles rectangle a parallelogram with all sides congruent rhombus an angle that measures 180 degrees straight angle a pair of opposite congruent angles formed by intersecting lines vertical angle two angles that are side by side and have a common vertex and ray adjacent angle two angles whose sum is 90 degrees complementary angles two angles whose sum is 180 degrees supplementary angles two lines that are opposite each other and never intersect parallel lines two lines that intersect to form a 90 degree angle perpendicular lines two lines on different planes and never intersect nor are they parallel skew lines a rectangle with four congruent sides square a quadrilateral with exactly one pair of parallel sides trapezoid a closed figure formed by three or more line segments that intersect only at their endpoints polygon having the same size and shape congruent are lines that cross at one common point intersecting is a polygon in which all sides are congruent and all angles are congruent regular polygon