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30 Cards in this Set
- Front
- Back
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point
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names a location
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line
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perfectly straight and extends forever in both directions
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plane
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perfectly flat surface that extends forever in all directions
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segment
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the part of a line between two points
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ray
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a part of a line that starts at one point and extends forever in one direction
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angle
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formed by two rays with a common endpoint called the vertex
measured in degrees |
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right angle
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measures 90 degrees
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acute angle
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measures less than 90 degrees
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obtuse angle
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measures greater than 90 degrees and less than 180 degrees
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complementary angles
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measures that add to 90 degrees
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supplementary angles
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measures that add to 180 degrees
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congruent
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figures that have the same size and shape
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vertical angles
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intersecting lines form two pairs of vertical angles, always congruent
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parallel lines
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two lines in a plane that never meet
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perpendicular lines
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they intersect at 90 degrees
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transversal
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a line that intersects any two or more other lines
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acute triangle
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3 acute angles
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right triangle
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1 right angle
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obtuse triangle
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1 obtuse angle
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equilateral triangle
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3 congruent sides and 3 congruent angles
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isoscles triangle
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at least 2 congruent sides and 2 congruent angles
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scalene triangle
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no congruent sides and no congruent angles
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triangle sum theorem
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the theorem that states that the measures of the angles in a triangle add up to 180 degrees
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polygon
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closed plane figure formed by 3 or more segments
named by number of sides |
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regular polygon
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all sides and angles have equal measures
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trapezoid
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exactly one pair of parallel sides
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parallelogram
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2 pairs of parallel sides
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rectangle
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4 right angles
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rhombus
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4 congruent angles
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square
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4 congruent sides and 4 right angles
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