__ | 1. | acute triangle | | A. | The shortest distance between any two points on a plane |

__ | 2. | equilateral triangle | | B. | A polygon in which all sides and angles are congruent. |

__ | 3. | irregular polygon | | C. | The part of a line having two end points. |

__ | 4. | isosceles triangle | | D. | A triangle with one right angle. |

__ | 5. | line | | E. | A triangle that has three congruent sides and angles. |

__ | 6. | line segment | | F. | A polygon in which all sides and angles are not congruent. |

__ | 7. | obtuse triangle | | G. | A triangle having two sides and two angles congruent. |

__ | 8. | regular polygon | | H. | A triangle with one angle whose measure is greater than 90˚. |

__ | 9. | right triangle | | I. | A triangle with no sides the same length. |

__ | 10. | scalene triangle | | J. | A triangle where all three angles are less than 90 degree |