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# Common Core Math II

### Key vocabulary for High School Math II

Term | Definition |
---|---|

e | The irrational number e 2.7182818284590... You can approximate e by substituting large values of n into the expression . |

x-axis | The horizontal axis in a Cartesian coordinate system. |

x-intercepts | Points where the graph of a function crosses or touches the x-axis. A function may have 0, 1, 2, or more x-intercepts. |

y-intercept | A point where the graph of a function crosses the y-axis. A function has at most one y-intercept. The y-intercept of the line with equation y = mx + b is the point (0, b). |

30-60-90 triangle | A right triangle with interior angle measures of 30°, 60°, and 90°. In a 30-60-90 triangle, the hypotenuse is always twice as long as the shorter leg and the longer leg is √3 times as long as the shorter leg |

45-45-90 triangle | An isosceles right triangle with interior angle measures of 45°, 45°, and 90°. In a 45-45-90 triangle, the two legs have the same length and the hypotenuse is √2 times as long as either leg. |

AAS theorem | A theorem stating that if two angles and a nonincluded side of one triangle are congruent to the corresponding two angles and side of another, then the triangles are congruent. AAS stands for "angle-angle-side." |

absolute value | A number's distance from zero on a number line. The absolute value of a number n is written |n| . |

absolute value function | f(x) = |x|. The magnitude of x. |

absolute value parent function | The function F(x) = |x|. It is the most basic function of the absolute value family of functions, and it is used as a building block for more complicated functions. |

acute angle | An angle that measures less than 90°. An acute angle is smaller than a right angle. |

acute triangle | A triangle in which all three interior angles are acute. |

addition rule | A rule stating that when two events are disjoint, or mutually exclusive, the probability that one or the other event occurs is the sum of the probabilities of the two events. P(A or B) = P(A) + P(B) |

adjacent | Next to each other. Two sides or two angles of a figure are adjacent if they are next to each other |

adjacent angles | Angles that share a vertex and one side. |

alternate interior angles | Two angles formed by a line (called a transversal) that intersects two parallel lines. The angles are on opposite sides of the transversal and inside the parallel lines. |

altitude of a triangle | The line segment from a vertex of a triangle that is perpendicular to the opposite side or to the line containing the opposite side. |