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8.1-8.3 Angles - Triangles

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Term
Definition
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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