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63 Cards in this Set
 Front
 Back
A point is a location in space. It has no size.

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A line is a series of points that extends in two opposite directions without end.

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A segment has two endpoints and all the points of the line between the endpoints.

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A ray consists of one endpoint and all the points of a line on one side of the endpoint.

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Points on the same line are collinear.

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A plane is a flat surface with no thickness that extends without end in all directions on the surface.

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Two lines that lie in the same plane are either intersecting or parallel.

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Intersecting lines have exactly one point in common.

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Parallel lines have no points in common.

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Skew lines are lines that are not parallel and do not intersect.

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Skew lines lie in different planes.

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An angle has two sides and a vertex. The sides are rays.

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The sides of an angle are rays and the vertex is their common endpoint.

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The vertex is the common endpoint of the rays

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Angles are measured in units called degrees.

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You use a protractor to find the measure of an angle.

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An acute angle measures less than 90 degrees.

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A right angle measures 90 degrees.

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An obtuse angle measures between 90 and 180 degrees.

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A straight angle measures 180 degrees.

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Lines that intersect to form right angles are called perpendicular lines.

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Angles are complimentary if the sum of the measures of two angles is 90 degrees.

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Angles are supplementary if the sum of the measures of two angles is 180 degrees.

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Vertical angles are formed by two intersecting lines.

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Congruent angles are angles with equal measures.. Congruent means equal.

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A trasversal crosses two or more lines at different points.

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Interior angles are on either side of a transversal between a pair of lines.

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Exterior angles are on either side of a transversal outside of a pair of lines.

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A triangle is a closed figure with three sides.

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An acute triangle has three acute angles.

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An obtuse triangle has one obtuse angle.

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A right triangle has one right angle.

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Segments that have the same length are congruent segments.

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An equilateral triangle has three congruent sides (all the sides are equal in length).

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An isosceles triangle has at least two congruent sides.

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A scalene triangle has no congruent sides.

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A polygon is a closed figure that has three or more line segments that do not cross.

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A triangle is a polygon with three sides.

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A quadrilateral is a polygon with four sides.

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A pentagon is a polygon with five sides.

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A hexagon is a polygon with six sides.

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An octagon is a polygon with eight sides.

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A decagon is a polygon with ten sides.

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A trapezoid is a quadrilateral that has exactly one pair of parallel lines.

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A parallelogram is a quadrilateral that has two pairs of parallel lines.

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There are three special types of parallelograms  a rectangle, a rhombus and a square.

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A rectangle is a parallelogram that has four right angles.

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A rhombus is a parallelogram that has four congruent sides. Congruent means equal.

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A square is a parallelogram that has four right angles and four congruent sides. Congruent means equal.

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Congruent figures have the same size and shape. They have congruent corresponding sides and congruent corresponding angles.

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Similar figures have the same shape, but not necessarily the same size.

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A figure is line symmetry if a line can be drawn thru the figure so that each half is a mirror image of the other.

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The line drawn thru the figure is called the line of symmetry.

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A transformation of a figure is a change in its position, shape or size.

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The new figure is the image of the original.

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A translation, or slide, is a transformation that moves every point of a figure the same distance and in the same direction.

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A reflection, or flip, is a transformation that flips a figure over a line.

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This line is the line of reflection.

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The new figure is a mirror image of the orginal.

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A rotation, or turn, is a transformation that turns a figure about a point.

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This point stays fixed and is called the center of rotation.

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Translations and reflections are alike because the figures stay the same size and shape.

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Translations and reflections are different because in a translation the object's orientation does not change, while in a reflection its orientation is reversed.

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