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## Geometry

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**Geometry**Points, Lines, and Shapes!**Plane**• plane A flat surface that stretches into infinity.**Point**• point A location in a plane or in space, having no dimensions.**Line Segment**• line segment Two points on a line, and all the points between those two points.**Line**• line A straight set of points that extends into infinity in both directions.**Ray**• ray part of a line, with one endpoint, and extending to infinity in one direction.**Intersecting Lines**• intersecting lines Lines that have one and only one point in common.**Parallel Lines**• parallel linesTwo lines are parallel if they are in the same plane and never intersect.**Perpendicular Lines**• perpendicular linesTwo lines are perpendicular if the angle between them is 90 degrees.**Angle**• angleThe union of two rays with a common endpoint, called the vertex.**Acute Angle**• acute angleA positive angle measuring less than 90 degrees.**Right Angle**• right angleAn angle whose measure is 90 degrees.**Obtuse Angle**• obtuse angleAn angle whose measure is greater than 90 degrees.**Straight Angle**• straight angle An angle that measures 180 degrees.**Polygon**• polygon A closed plane figure made up of several line segments that are joined together.**Triangle**• triangle A three-sided polygon. • Triangles can be classified according to the measures of their angles and their sides.**Acute Triangle**• acute triangleA triangle each of whose angles measures less than 90 degrees.**Right Triangle**• right triangle A triangle that contains a right angle.**Obtuse Triangle**• obtuse triangle A triangle with an obtuse angle.**Scalene Triangle**• scalene triangleA triangle with no congruent (exactly the same size and shape) sides.**Isosceles Triangle**• isosceles triangleA triangle with two congruent (exactly the same size and shape) sides.**Equilateral Triangle**• equilateral triangleA triangle with all sides that are congruent (exactly the same size and shape).**Circle**• circle The set of points in a plane that are a fixed distance from a given point, called the center.**Circle**• circle The set of points in a plane that are a fixed distance from a given point, called the center.**Quadrilateral**• quadrilateral Any four-sided figure is called a quadrilateral.**Parallelogram**• parallelogram A quadrilateral with opposite sides parallel.**Rectangle**• rectangle A parallelogram with four 90-degree (right) angles.**Square**• square A parallelogram with four congruent (equal) sides and four 90 degree (right) angles.**Rhombus**• rhombus A parallelogram with four congruent (equal) sides. • Opposite angles are congruent.**Trapezoid**• trapezoid A quadrilateral that has exactly one pair of parallel sides. • The parallel sides are called bases. • The non-parallel sides are called legs. • If the legs have the same length, then the trapezoid is an isosceles trapezoid. Isosceles Trapezoid Isosceles Trapezoid**Kite**• kite A quadrilateral that is shaped like a diamond. Sometimes people like to fly them! • It has two distinct pairs of adjacent (side-by-side) congruent sides.**Cylinder**• cylindera solid figure that has two parallel bases that are congruent circles**Cone**• conea solid figure that has a flat, circular base and one vertex**Cube**• cubea solid figure with six congruent square faces**Square Pyramid**• Square Pyramida solid figure with a square base and with four triangular faces that have a common point**Rectangular Prism**• Rectangular Prisma solid figure in which all six faces are rectangles.**Rotation (turn)**• Rotation (turn)a movement of a figure to a new position by turning it around a vertex**Reflection (flip)**• Reflection (flip)a movement of a figure to a new position by flipping it over a line**Translation (slide)**• Translation (slide)a movement of a figure to a new position along a straight line