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math

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 straight 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 distant apart at every point  
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oblique   Lines that are not parallel or perpendicular  
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intersect   To cut or divide by passing through or across  
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protractor   A tool used to measure angles  
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degree   A unit for measuring angles also a unit measuring temperature  
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right angle   An angle that measures 90 degrees  
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straight angle   An angle of 180 degrees  
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supplementary angles   Angles have a sum of 180 degrees  
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complementary angles   angles having a sum of 90 degrees  
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Vertical angles   pairs of opposite formed by intersecting lines  
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opposite angles   when two lines intersect  
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polygon   A closed figure with sides made of straight 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   having all equal sides  
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scalene triangle   A triangle with no equal sides is a scalene triangle  
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acute triangle   a triangle with three acute angles  
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obtuse angle   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 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 circle   an angle greater than 180 degrees  
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