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Geometry Points, Lines, and Shapes!

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Plane plane A flat surface that stretches into infinity.

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Point point A location in a plane or in space, having no dimensions.

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Line Segment line segment Two points on a line, and all the points between those two points.

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Line line A straight set of points that extends into infinity in both directions.

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Ray ray part of a line, with one endpoint, and extending to infinity in one direction.

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Intersecting Lines intersecting lines Lines that have one and only one point in common.

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Parallel Lines parallel lines Two lines are parallel if they are in the same plane and never intersect.

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Perpendicular Lines perpendicular lines Two lines are perpendicular if the angle between them is 90 degrees.

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Angle angle The union of two rays with a common endpoint, called the vertex.

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Acute Angle acute angle A positive angle measuring less than 90 degrees.

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Right Angle right angle An angle whose measure is 90 degrees.

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Obtuse Angle obtuse angle An angle whose measure is greater than 90 degrees.

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Straight Angle straight angle An angle that measures 180 degrees.

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Polygon polygon A closed plane figure made up of several line segments that are joined together.

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Triangle triangle A three-sided polygon. Triangles can be classified according to the measures of their angles and their sides.

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Acute Triangle acute triangle A triangle each of whose angles measures less than 90 degrees.

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Right Triangle right triangle A triangle that contains a right angle.

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Obtuse Triangle obtuse triangle A triangle with an obtuse angle.

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Scalene Triangle scalene triangle A triangle with no congruent (exactly the same size and shape) sides.

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Isosceles Triangle isosceles triangle A triangle with two congruent (exactly the same size and shape) sides.

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Equilateral Triangle equilateral triangle A triangle with all sides that are congruent (exactly the same size and shape).

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Circle circle The set of points in a plane that are a fixed distance from a given point, called the center.

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Circle circle The set of points in a plane that are a fixed distance from a given point, called the center.

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Quadrilateral quadrilateral Any four-sided figure is called a quadrilateral.

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Parallelogram parallelogram A quadrilateral with opposite sides parallel.

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Rectangle rectangle A parallelogram with four 90-degree (right) angles.

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Square square A parallelogram with four congruent (equal) sides and four 90 degree (right) angles.

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Rhombus rhombus A parallelogram with four congruent (equal) sides. Opposite angles are congruent.

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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

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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.

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Cylinder cylinder a solid figure that has two parallel bases that are congruent circles

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Cone cone a solid figure that has a flat, circular base and one vertex

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Cube cube a solid figure with six congruent square faces

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Square Pyramid Square Pyramid a solid figure with a square base and with four triangular faces that have a common point

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Rectangular Prism Rectangular Prism a solid figure in which all six faces are rectangles.

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Rotation (turn) Rotation (turn) a movement of a figure to a new position by turning it around a vertex

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Reflection (flip) Reflection (flip) a movement of a figure to a new position by flipping it over a line

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Translation (slide) Translation (slide) a movement of a figure to a new position along a straight line

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