        ### Geometry Vocabulary

 1 point _____ two angles in the same plane that have the same vertex and a common side but do not have any interior points in common 2 line _____ lines that meet to form right angles 3 ray _____ the numbers on a protractor used to measure angles 4 line segment _____ points not on the same line 5 plane _____ if three sides of one triangle are congruent to three sides of another triangle, then the two triangles are congruent 6 postulates _____ points on the same plane 7 noncollinear points _____ a line that intersects two or more other lines, each at a different point. 8 coplanar points _____ an angle that measures between 180 and 360 degrees 9 theorems _____ an angle that measures 360 degrees 10 straight angle _____ statements that can be proved 11 acute angle _____ in a right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse 12 obtuse angle _____ angles that are interior angles on opposite sides of the transversal 13 transversal _____ statements accepted without proof 14 perpendicular _____ a triangle that has 3 sides all of different lengths 15 parallel _____ if point B is in the interior of angle AOC then the measure of angle AOB + the measure of angle BOC is equal to the measure of angle AOC 16 alternate interior angles _____ the two congruent sides of an isosceles triangle 17 same side interior angles _____ lines that are equal distance from each other and will never meet 18 corresponding angles _____ a tool used to measure angles 19 supplementary angles _____ if the square of the length of the longest side of a triangle is equal to the sum of the squares of the lengths of the two shorter sides, then the triangle is a right triangle 20 complementary angles _____ angles that are in the same position on the same side of a transversal. If you cut one out and layed it on top of the other they would match 21 protractor _____ a part of a line with one endpoint. It has an infinite number of points on it. 22 scales _____ 2 angles whose measurements together add up to 180 degrees 23 adjacent angles _____ in a right triangle, the side opposite the right angle 24 angle addition postulate _____ angle that measures between 90 and 180 degrees 25 complete angle _____ interior angles on the same side of the transversal 26 reflex angle _____ a triangle that has 3 sides all of which are the same length 27 zero angle _____ angle that measures between 0 and 90 degrees 28 isosceles triangle _____ part of a line with two endpoints. It has an infinite number of points on it. 29 scalene triangle _____ a triangle that has 2 sides with the same length 30 equilateral triangle _____ has no size and no dimensions; indicates a definite location 31 equiangular triangle _____ an angle that has a measurement of 0 degrees 32 legs _____ measures 180 degrees 33 acute triangle _____ a triangle with 3 acute angles 34 obtuse triangle _____ a triangle that has 3 angles all of which are the same measurement 35 side-side-side postulate _____ a triangle with one obtuse angle 36 side-angle-side postulate _____ if two angles and the included side of one triangle are congruent to corresponding parts of another triangle, the triangles are congruent 37 angle-side-angle postulate _____ a flat surface that has no thickness or boundaries 38 hypotenuse _____ if two sides and the included angle of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent 39 pythagorean theorem _____ straight, but it has no thickness. It is an infinite set of points that extends in both directions. 40 converse of the Pythagorean theorem _____ 2 angles whose measurements together add up to 90 degrees

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