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# Advancement Ch. 3

### Advancement Challenge #3 Crossword Puzzle

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

circle | a closed plane curve consisting of all points at a given distance from a point within it called the center. |

center | the middle point, as the point within a circle or sphere equally distant from all points of the circumference or surface, or the point within a regular polygon equally distant from the vertices |

radius | a straight line extending from the center of a circle or sphere to the circumference or surface |

diameter | a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end |

chord | the line segment between two points on a given curve |

secant | an intersecting line, especially one intersecting a curve at two or more points |

tangent | touching at a single point, as a tangent in relation to a curve or surface that is in contact along a single line or element, as a plane with a cylinder. |

concentric | having a common center, as circles or spheres. |

central angle | an angle formed at the center of a circle by two radii |

inscribed angle | angle whose vertex is on a circle and whose sides contain chords of the circle |

minor arc | less than 90 degrees |

major arc | more than 90 degrees |

semicircle | anything having or arranged in the form of a half of a circle. |

intercepted arc | arc that lies in the interior of an inscribed angle and has endpoints on the angle |

inscribed | to draw or delineate (one figure) within another figure so that the inner lies entirely within the boundary of the outer, touching it at as many points as possible |

circumscribed | to draw a figure around another figure so as to touch as many points as possible |

equidistant | equally distant |

apothem | a perpendicular from the center of a regular polygon to one of its sides |

circumference | the outer boundary, especially of a circular area and perimeter |

arc length | portion of the circumference of the circle |

area | any particular extent of space or surface; part |

sector | a plane figure bounded by two radii and the included arc of a circle |