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33 Cards in this Set
- Front
- Back
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What is an angle?
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Two rays with a common endpoint; two sides that share a common endpoint
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What is a vertex?
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the common endpoint of the two sides or two rays that form an angle
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What is a degree?
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the most common unit of measure for angles
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What is a right angle?
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90 degree angle
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What is an acute angle?
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less than 90 degree angle
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What is an obtuse angle?
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an angle between 90 degrees and 180 degrees
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What is a straight angle?
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exactly 180 degrees
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What is a complimentary angle?
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two angles are complimentary if the sum of their measures is 90 degrees
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What is a supplementary angle?
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two angles are supplementary if the sum of their measures is 180 degrees
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What does bisect mean?
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to separate something into two congruent parts
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What does congruent mean?
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having the same measure; equal
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What does perpendicular mean?
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two line segments are perpendicular if they meet at right angles
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What is a polygon?
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is a simple, closed, two-dimensional figure formed by 3 or more sides
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What is a triangle?
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polygon with 3 sides
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What is a quadrilateral?
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polygon with 4 sides
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What is a pentagon?
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polygon with 5 sides
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What is a hexagon?
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polygon with 6 sides
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What is a heptagon?
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polygon with 7 sides
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What is an octagon?
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polygon with 8 sides
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What is a regular polygon?
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when all the sides of a polygon are congruent and all of the angles are congruent
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What is a scalene triangle?
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triangle with no sides congruent
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What is a isosceles triangle?
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triangle with at least two sides congruent
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What is an equilateral triangle?
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triangle with all sides congruent and all angles congruent
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What is a rectangle?
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opposite sides are congruent, all angles are right angles, opposite sides are parallel
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What is a square?
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all sides congruent, all angles are right angles, opposite sides are parallel
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What is a parallelogram?
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opposite sides congruent, opposite sides parallel, opposite angles congruent
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What is a rhombus?
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all sides congruent, opposite sides parallel, opposite angles are congruent
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What is line symmetry?
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when two halves of a figure match
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What is line of symmetry?
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the line that separates the figure into two matching halves
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What is rotational symmetry?
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some figures can be turned or rotated less than 360 degrees about a fixed point so that the figure looks exactly as it did before it turned
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What are similar figures?
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figures that have the same shape but not necessarily the same size
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What are congruent figures?
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figures that have the same size and shape
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What are corresponding parts?
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the parts of congruent figures that match
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