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Lines and Angles

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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Term
Definition
Line   a long, narrow mark or band  
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Line segment   a line that is bounded by two distinct end points  
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Ray   A line that starts at a point and goes off in a particular direction to infinity  
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Right Angle   an angle measuring 90 degrees  
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Acute Angle   an angle measuring less than 90 degrees  
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Obtuse Angle   an angle measuring greater than 90 degrees  
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Perpendicular Lines   Lines that intersect to make a right angle  
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Parallel Lines   Two lines that are always the same distance apart and never touch  
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Right Triangle   A triangle with exactly one right angle  
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Equilateral Triangle   A triangle with all 3 interior angles measuring 60 degrees  
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Line of Symmetry   a line across the figure such that the figure can be folded along the line into mirroring parts  
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Adjacent   having a common vertex or side  
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Congruent   equal  
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Protractor   an instrument for measuring angles  
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End point   a point or value that marks the end of a ray or one of the ends of a line segment or interval  
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Square   A plane figure with two sets of parallel sides, that are all congruent, and four right angles  
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Rectangle   A plane figure with two sets of parallel sides whose adjacent sides are not congruent and all right angles.  
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Kite   A plane figure whose two sets of congruent sides are adjacent to each other  
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Triangle   a plane figure with three straight sides and three angles  
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Rhombus   a plane figure with four congruent sides, one set of congruent obtuse angles, and one set of congruent acute angles.  
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Created by: hollydolly21
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