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Unit 4 Vocabulary

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Ray   A part of a line that has one endpoint and extends without end in one direction  
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Angle   A figure formed by two rays or line segments with a common endpoint  
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Line   A strait path that goes on forever in opposite directions  
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Perpendicular   Lines, line segments, or rays are perpendicular if they form right angles  
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Parallel   The same distance apart at every point  
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Oblique   Not parallel or perpendicular  
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Intersect   To cut or divide by passing through one another  
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Portractor   A protractor is a tool that is used to measure angles in degrees  
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Degree   A unit for measuring angles also a unit for measuring temperature  
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Right Angle   An angle that measures 90 degrees  
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Strait Angle   An angle that measures 180 degrees  
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supplementary angles   angles having a sum of 180 degrees  
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complementary angles   angles having a sum of 90 degrees  
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opposite angles   the angles formed when two lines intersect  
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vertical angles   pairs of opposite angles formed by intersecting lines  
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Polygon   A closed plane figure with sides made of strait line segments  
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Congruent   Exactly the same size and shape  
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Isosceles Triangle   A triangle with at least two congruent sides  
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Equilateral Triangle   A triangle with all equal sides  
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Scalene Triangle   A triangle with no equal sides  
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Acute Triangle   A triangle with three acute angles  
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Obtuse Triangle   A triangle with one obtuse angle  
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Right Triangle   A triangle with one right angle  
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Right Trapezoid   A trapezoid with at least one right angle  
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Circle   A plane figure that forms a closed path so that all the points on the path are the same distance from a point called the center  
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Reflex Angle   An angle greater than 180 degrees  
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