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40 Cards in this Set
- Front
- Back
adjacent angle
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Two angles that have the same vertex, share a common side, and do not overlap.
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alternate exterior angles
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Nonadjacent exterior angles found on opposite sides of the transversal.
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alternate interior angles
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Nonadjacent interior angles found on opposite sides of the transversal.
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altitude
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A line segment that is perpendicular to the base of a figure with endpoints on the base and the side opposite the base.
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base
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The base of a parallelogram or a triangle is any side of the figure. The bases of a trapezoid are the parallel sides.
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bilateral symmetry
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A figure that has line symmetry has bilateral symmetry.
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center
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The given point from which all points on the circle are the same distance.
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circle
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The set of all points in a plane that are the same distance from a given point called the center.
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circumference
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The distance around a circle.
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complementary
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Two angles are complementary if the sum of their measures is 90°.
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congruent
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Line segments that have the same length, or angles that have the same measure, or figures that have the same size and shape.
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corresponding angles
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Angles that have the same position on two different parallel lines cut by a transversal.
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corresponding parts
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Parts of congruent or similar figures that match.
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diagonal
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A line segment that joins two nonconsecutive vertices of a polygon.
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diameter
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The distance across a circle through its center.
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dilation
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A transformation that alters the size of a figure but not its shape.
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exterior angles
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Four of the angles formed by the transversal and two parallel lines.
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interior angles
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Four of the angles formed by the transversal and two parallel lines. Exterior angles lie outside the parallel lines.
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line symmetry
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A figure is said to have line symmetry when two sides match.
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line of symmetry
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Each half of a figure is a mirror image of the other half when a line of symmetry is drawn.
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parallel lines
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Two lines in the same plane that do not intersect.
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parallelogram
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A quadrilateral with opposite sides parallel and congruent.
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perpendicular lines
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Lines that intersect to form a right angle.
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π
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The ratio of a circle to the diameter of the circle. Approximations for π are 3.14 or 22/7.
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polygon
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A simple closed figure in a plane formed by three or more line segments.
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quadrilateral
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A closed figure with four sides and four vertices, including squares, rectangles, and trapezoids.
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radius
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The distance from the center to any point on the circle.
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reflection
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A transformation where a figure is flipped over a line. Also called a flip.
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regular polygon
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A polygon having all sides congruent and all angles congruent.
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rhombus
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A parallelogram with four congruent sides.
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rotation
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A transformation where a figure is turned around a fixed point. Also called a turn.
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rotational symmetry
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Any figure that can be turned or rotated less than 360° about a fixed point so that the figure looks exactly as it does in its original position has rotational or turn symmetry.
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supplementary
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Two angles are supplementary if the sum of their measures is 180°.
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tessellation
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A tessellation is a pattern of repeating figures that fit together with no overlapping or empty spaces. Tessellations can be formed using transformations.
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transformation
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A movement of a geometric figure.
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translation
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A transformation where a figure is slid from one position to another without being turned. Also called a slide.
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transversal
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A line that intersects two parallel lines to form eight angles.
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trapezoid
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A quadrilateral with exactly one pair of parallel lines.
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turn symmetry
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Any figure that can be turned or rotated less than 360° about a fixed point so that the figure looks exactly as it does in its original position has rotational or turn symmetry.
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vertical angles
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Two pairs of opposite angles formed by two intersecting lines. The angles formed are congruent.
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