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# 7th: PSSA Vocabulary

### Use the flashcards to review important math vocabulary.

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

Acute triangle | A triangle that has each angle measuring less than 90 degrees. |

Coordinate plane | A two-dimensional system in which the coordinates of a point are its distances from both a horizontal and a vertical line called the axes. |

Ordered pairs | Points on a coordinate plane. (x,y) |

Origin | The point at which the two axes intersect has the coordinates (0,0). |

Corresponding angles | Angles in the same relative position in similar or congruent figures. |

Equilateral triangle | A triangle whose sides are all the same length. |

Experimental probability | A statement of probability based on the results of a series of trials. |

Isosceles triangle | A triangle that has exactly two congruent sides. |

Linear function | An equation whose graph in a coordinate plane is a straight line. |

Obtuse triangle | A triangle with one angle that measures more than 90º. |

Order of operations | Rules describing what sequence to use in evaluating expressions; also known as PEMDAS |

Prism | A three-dimensional solid that has two congruent and parallel faces that are polygons. The remaining faces are rectangles. |

Proportion | An equation showing that two ratios are equal. |

Pythagorean theorem | A formula for finding the length of a side of a right triangle when the lengths of two sides are given. |

Scalene triangle | A triangle with no congruent sides. |

Scatterplot | A graph with points plotted to show a relationship between two variables. |

Stem-and-leaf plot | A data display that shows groups of data arranged by place value. |

Surface area | The sum of the areas of all of the faces of a three-dimensional figure. |

Theoretical probability | A statement of the probability of an event without doing an experiment or analyzing data. |

Parallel lines | Two or more lines that will never intersect. |

Perpendicular lines | Two or more lines that intersect forming a right angle. |

Similar Figures | Two figures that are the same shape, but not necessarily the same size. Their corresponding side lengths have equal ratios. |

Congruent | Means the same. |

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tsuprick