8.1-8.3 Angles - Triangles
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| vertex | The point at which two line segments connect
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| obtuse angle | angle between 90 and 180 degrees
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| acute angle | angle between 0 and 90 degrees
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| right | angle that is exactly 90 degrees
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| straight | angle that is exactly 180 degrees
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| vertical angles | two angles that are opposite each other formed by the intersection of two lines
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| congruent angles | two angles that have the same measurement
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| adjacent angles | two angles with a common line and vertex
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| complementary angles | two angles with a sum of 90 degrees
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| supplementary angles | two angles with a sum of 180 degrees
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| acute triangle | triangle with three acute angles
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| obtuse triangle | triangle with one obtuse angle
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| right triangle | triangle with one 90 degree angle
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| scalene triangle | triangle with three unequal sides
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| isosceles triangle | triangle with two equal sides
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| equilateral triangle | triangle with three equal sides
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| ray | a line with a point at one end and an arrow at the other end
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