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# PSSA Vocab-PVSD

### PSSA Vocab - PVSD 11th&12th grade

Question | Answer |
---|---|

Altitude of a triangle | a line drawn inside a triangle from the base to the opposite angle. It is perpendicular to the base. |

analytical geometry | geometry that is graphed on the coordinate plane and uses mostly algebra. |

angle bisector | a ray that splits an angle into 2 smaller and equal angles. |

arc | a part of circle between 2 points. |

binomial | a polynimial with only 2 terms. ex: 2x+3y |

central angle | an angle that starts in the center of a circle or regular polygon and the sides meet the edge of the circle or the corners of the polygon. |

circumscribed polygon | a polygon that surrounds a cirlce and the circle touches all the sides of the polygon. |

dependent events | when the outcome of one event affects the outcome of another event.ex: if you take one card from a deck, the outcome of drawing the second card has changed. |

direct proportion | two quantities (ratios/fractions) that have a constant ratio or equal value.ex: if 2 pizzas cost $10, then 3 pizzas will cost $15; the ratio is 1/5. |

exponential function | a function that has a variable in the exponent position. |

Inscribed Angle | an angle whose vertex is on the circle and sides are chords of the circle. |

Interquartile Range | The difference between the first and third quartile in a set of data. (quartiles are the three values that divide the set of data into fourths)Ex: IQR would be the 50% below the top 25% and above the bottom 25% |

Inverse Proportion | two quantities that are inversely related. ex: as a car's age increases, its value decreases |

Irrational Number | a number that cannot be represented as a fraction or ratio. Decimals that do not repeat or terminate.Ex: pi, square root of 2 |

Line of Best Fit (regression line) | a line drawn on a scatter plot to best estimate the relationship between the two sets of data. |

Median of a triangle | a line segment drawn from the vertex of an angle to the midpoint of the opposite side. |

Monomial | A polynomial that is the product of one or more variables.Ex: 2x, 4ab |

Odds | The ratio of the number of ways an event can occur (successess) to the number of ways it doesnt (failures).ex: the odds of rolling a 2 on a die are 1 to 5, 1/5, 1:5 |

Outlier | a value that is much greater or much less than the rest of a set of data (greater that 1.5 times the IQR) |

Polynomial | an algebraic expression that contains one or more monomials. ex: 2a, 3x+8y, 4xy-3x+2 |

Quadratic Function | equations which are expressed in the form y=ax^+bx+cHint: use FOIL to factor and solve |

Rational Number | any number that can be expressed as a fraction or ratio of two integers, can be repeating in decimal form. Ex: .5, -9, 2/3, .0505050... |

Real Number | all rational and irrational numbers. |

Secant of a circle | a line that intersects the circle in exactly two points. |

Semicircle | an arc of a circle that is 180 degrees and endpoints are the diameter. |

Slope | the ratio (fraction) that expresses change in the vertical distance to the change of the horizontal distance between two points on a line. Rise over runEx: change in y/change in x |

Tangent of a circle | a line that touches a circle in only one point. |

Trinomial | a polynomial with three terms.ex: 7a+4b+9c |

incribed polygon | a polygon that is surrounded by a cirlce and whose vertices are located on the circle |

Midpoint | the point halfway between the endpoints of a line segment |

absolute value | a number's distance from 0.ex: |-3| = 3 |