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32 Cards in this Set
- Front
- Back
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acute angle
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An angle whose measure is greater than 0° and less than 90°.
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acute triangle
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A triangle in which all three angles are acute.
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classify
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To sort into categories or to arrange into groups by attribute(s). To classify triangles is to categorize a triangle according to its angles (acute, obtuse, or right) or the lengths of its sides (equilateral, isosceles, or scalene).
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congruent
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Two or more figures having exactly the same shape and size; coinciding when superimposed.
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corresponding
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Angles or sides in the same relative position on two congruent or similar figures.
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equilateral triangle
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A triangle having equal sides
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irregular polygon
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A polygon whose sides and angles are not all congruent.
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isosceles triangle
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A triangle with at least two congruent sides.
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line of symmetry
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A line that divides a figure into two congruent halves that are mirror images of each other.
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obtuse angle
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An angle whose measure is greater than 90° and less than 180°.
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obtuse triangle
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A triangle containing one obtuse angle.
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parallel
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Lines or segments in the same plane that never intersect no matter how far they are extended; they are equidistant from each other.
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parallelogram
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A quadrilateral with two pairs of parallel sides.
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perimeter
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The distance around a closed figure
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quadrilateral
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A polygon with 4 sides and 4 angles.
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regular polygon
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A polygon in which all sides and all angles are congruent.
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rhombus
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A parallelogram with two adjacent sides congruent (all four sides are congruent).
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right angle
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An angle formed by two perpendicular lines, the measure of which is 90°.
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right triangle
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A triangle with one right angle.
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scalene triangle
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A triangle with no congruent sides
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similar triangles
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have the same shape but not necessarily the same size
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straight angle
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An angle that has a measure of 180°; an angle formed by two rays in opposite directions from their common endpoint.
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trapezoid
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A quadrilateral with exactly one pair of parallel sides.
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triangle
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A polygon with three sides and three angles
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vertex
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(1)The common endpoint of two sides of a polygon; (2) the common endpoint of two rays that form an angle.
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decagon
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A polygon with ten sides and ten angles
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hexagon
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A polygon with six sides and six angles
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heptagon
septagon |
A polygon with seven sides and seven angles
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octagon
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A polygon with eight sides and eight angles
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nonagon
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A polygon with nine sides and nine angles
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pentagon
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A polygon with five sides and five angles
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perpendicular
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Two lines, segments, or rays that intersect to form right angles.
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