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CC3 Chapter 9 Vocab

TermDefinition
AA (Angle-Angle Similarity) If two angles of one triangle are congruent to the two corresponding angles of another triangle
Acute angle An angle with a measure greater than 0º and less than 90º.
adjacent angles the angles must satisfy these conditions, the two angles must have a common side; must have a common vertex; and may have no interior points in common.
alternate interior angles Angles between a pair of lines that switch sides of a third intersecting line
complementary angles Two angles whose measures add up to 90°.
corresponding angles When two lines are intersected by a transversal, angles on the same side of the two lines and on the same side of the transversal
exterior angles When a side of a triangle is extended to form an angle outside of the triangle
hypotenuse The longest side of a right triangle (the side opposite the right angle).
legs (of a right triangle) The two sides of a right triangle that form the right angle.
obtuse angle Any angle that measures between (but not including) 90º and 180º.
parallel Two or more straight lines on a flat surface that do not intersect
perfect square A number that is the product of an integer and itself.
perpendicular Two rays, line segments, or lines that meet (intersect) to form a right angle (90º)
Pythagorean Theorem The statement relating the lengths of the legs of a right triangle to the length of the hypotenuse: (leg #1)2 + (leg #2)2 = hypotenuse2.
radical sign √
remote interior angles If a triangle has an exterior angle, the remote interior angles are the two angles not adjacent to the exterior angle.
right angle An angle that measures 90º. A small square is used to note a right angle, as shown in the example below.
square (of a number) To square a number means to multiply it by itself, or raise it to the second power.
square root A number a is b if a² = b.
supplementary angles Two angles A and B for which A + B = 180°.
straight angle An angle that measures 180º. This occurs when the rays of the angle point in opposite directions, forming a line.
transversal A line that intersects two or more other lines on a flat surface (plane).
vertex a point where two or more line segments or rays meet to form a “corner”, such as in a polygon or angle.
vertical angles The two opposite (that is, non-adjacent) angles formed by two intersecting lines.
Created by: reiderk
 

 



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