Rectangle | | Same size, same shape. |

Equiangular | | Lines that are not coplanar. |

Supplementary | | A polygon with 5 sides. |

Tangent | | The distance from the center of a regular polygon to a side. |

Corresponding | | Points all in one line. |

Hypotenuse | | Two angles whose measures have the sum of 180. |

Pentagon | | A segment joining two non-consecutive vertices of a polygon. |

Collinear | | The sum of the length of the sides of a polygon. |

Triangle | | A segment whoes endpoints lie on a circle. |

Chord | | A number that describes the steepness of a line. |

Perimeter | | A chord that contains the center of a circle. |

Isosceles | | Two angles in corresponding positions relative to two lines. |

Height | | A segment from a vertex to the midpoint of the opposite side. |

Angle | | A polygon with four sides. |

Diameter | | A quadrilateral with four right angles. |

Theorem | | A statement excepted as true without proof. |

Similar | | A quadrilateral with four right angles and four congruent sides. |

Apothem | | A line that intersects a circle in exactly one point. |

Median | | A polygon with 8 sides. |

Parallelogram | | A triangle with two congruent sides. |

Straight | | An angle with a measure of 180. |

Diagonal | | A polygon with three sides. |

Decagon | | A line that contains a chord. |

Slope | | The ray that divides the angle into 2 congruent angles. |

Congruent | | The length of the altitude of a polygon. |

Rhombus | | A polygon with 10 sides. |

Octagon | | A quadrilateral with both pairs of opposite sides parallel. |

Equilateral | | Coplanar lines that do not intersect. |

Acute | | Two angles whose measures have the sum of 90. |

Bisector | | A polygon that is equilateral and equiangular. |

Obtuse | | An angle with a measure of 90. |

Regular | | The side of a right triangle opposite the right angle. |

Complementary | | A triangle with all sides equal. |

Quadrilateral | | The point that divides a segment into two congruent segments. |

Opposite | | An angle with measure between 0 and 90. |

Segment | | A quadrilateral with four congruent sides.s |

Parallel | | A triangle with all angles equal. |

Square | | A figure formed by two rays with a common endpoint. |

Right | | An angle with measure between 90 and 180. |

Skew | | Points all in one plane. |

Coplanar | | Two points on a line and all the points between them. |

Midpoint | | Two rays with a common endpoint pointing in opposite directions. |

Postulate | | Same shape, different size. |

Secant | | A statement that can be proved. |