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CC3 Chapter 9 Vocab
Term | Definition |
---|---|
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. |