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### 63 Cards in this Set

• Front
• Back
 A point is a location in space. It has no size. blank A line is a series of points that extends in two opposite directions without end. blank A segment has two endpoints and all the points of the line between the endpoints. blank A ray consists of one endpoint and all the points of a line on one side of the endpoint. blank Points on the same line are collinear. blank A plane is a flat surface with no thickness that extends without end in all directions on the surface. blank Two lines that lie in the same plane are either intersecting or parallel. blank Intersecting lines have exactly one point in common. blank Parallel lines have no points in common. blank Skew lines are lines that are not parallel and do not intersect. blank Skew lines lie in different planes. blank An angle has two sides and a vertex. The sides are rays. blank The sides of an angle are rays and the vertex is their common endpoint. blank The vertex is the common endpoint of the rays blank Angles are measured in units called degrees. blank You use a protractor to find the measure of an angle. blank An acute angle measures less than 90 degrees. blank A right angle measures 90 degrees. blank An obtuse angle measures between 90 and 180 degrees. blank A straight angle measures 180 degrees. blank Lines that intersect to form right angles are called perpendicular lines. blank Angles are complimentary if the sum of the measures of two angles is 90 degrees. blank Angles are supplementary if the sum of the measures of two angles is 180 degrees. blank Vertical angles are formed by two intersecting lines. blank Congruent angles are angles with equal measures.. Congruent means equal. blank A trasversal crosses two or more lines at different points. blank Interior angles are on either side of a transversal between a pair of lines. blank Exterior angles are on either side of a transversal outside of a pair of lines. blank A triangle is a closed figure with three sides. blank An acute triangle has three acute angles. blank An obtuse triangle has one obtuse angle. blank A right triangle has one right angle. blank Segments that have the same length are congruent segments. blank An equilateral triangle has three congruent sides (all the sides are equal in length). blank An isosceles triangle has at least two congruent sides. blank A scalene triangle has no congruent sides. blank A polygon is a closed figure that has three or more line segments that do not cross. blank A triangle is a polygon with three sides. blank A quadrilateral is a polygon with four sides. blank A pentagon is a polygon with five sides. blank A hexagon is a polygon with six sides. blank An octagon is a polygon with eight sides. blank A decagon is a polygon with ten sides. blank A trapezoid is a quadrilateral that has exactly one pair of parallel lines. blank A parallelogram is a quadrilateral that has two pairs of parallel lines. blank There are three special types of parallelograms -- a rectangle, a rhombus and a square. blank A rectangle is a parallelogram that has four right angles. blank A rhombus is a parallelogram that has four congruent sides. Congruent means equal. blank A square is a parallelogram that has four right angles and four congruent sides. Congruent means equal. blank Congruent figures have the same size and shape. They have congruent corresponding sides and congruent corresponding angles. blank Similar figures have the same shape, but not necessarily the same size. blank 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. blank The line drawn thru the figure is called the line of symmetry. blank A transformation of a figure is a change in its position, shape or size. blank The new figure is the image of the original. blank A translation, or slide, is a transformation that moves every point of a figure the same distance and in the same direction. blank A reflection, or flip, is a transformation that flips a figure over a line. blank This line is the line of reflection. blank The new figure is a mirror image of the orginal. blank A rotation, or turn, is a transformation that turns a figure about a point. blank This point stays fixed and is called the center of rotation. blank Translations and reflections are alike because the figures stay the same size and shape. blank Translations and reflections are different because in a translation the object's orientation does not change, while in a reflection its orientation is reversed. blank