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# enotes

### math

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

acute angle | angle less than 90 degrees | ||

obtuse angle | angle greater than 90 degrees | ||

right angle | angle equaling 90 degrees | ||

acute triangle | triangle with all acute angles | ||

obtuse triangle | triangle with one obtuse angle | ||

right triangle | triangle with one right angle | ||

scalene triangle | triangles whose sides are all different measures | ||

isosceles triangle | triangle with two sides that are congruent | ||

equilateral triangle | triangle with all three sides congruent | ||

equiangular triangle | triangle with three congruent angles | ||

The measure of an angle in an equilateral or equiangular triangle | 60 degrees | ||

The sum of all angles in a triangle | 180 degrees | ||

exterior angle of a triangle | angle formed by one side of a triangle and the extension of another side | ||

remote interior angles | interior angles not adjacent to a given exterior angle | ||

congruent triangles | triangles that have corresponding parts congruent | ||

congruence transformations | occurs when a slide | flip | or turn of a triangle does not change the size or shape |

included angle | angle formed by two sides of a triangle | ||

SSS Postulate | If the sides of one triangle are congruent to the sides of another triangle | then the two triangles are congruent. | |

SAS Postulate | If two sides of a triangle and their included angle are congruent to two sides of another triangles and their included angle | then the triangles are congruent. | |

included side | the side between two angles of a triangle | ||

ASA Postulate | If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle | then the two triangles are congruent. | |

AAS Postulate | If two angles and a nonincluded side of one triangle are congruent to the corresponding angles and side of a second triangle | then the two triangles are congruent. | |

SSA Postulate | a valid test of congruence for right triangles | ||

base angles | two angles formed by the base and the congruent sides of an isosceles triangle | ||

vertex angle | angle formed by the two congruent sides of an isosceles triangle | ||

coordinate proof | uses figures in the coordinate plane and algebra to prove geometric concepts |

Created by:
Elive