Geometry vocabulary terms for MSM 1 and MSM 2.

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Plane

A flat surface that extends indefinately in all directions.

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Point

A dot that represents a location on a plane.

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Line

A collection of points that extend indefinately in both directions.

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Line Segment

Part of a line consisting of two endpoints and all the points between them.

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Ray

Part of a line that has one endpoint and extends indefinately in one direction.

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Polygon

A closed figure whose sides are straight line segments.

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Triangle

A polygon with 3 sides.

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Quadrilateral

A polygon with 4 sides.

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Pentagon

A polygon with 5 sides.

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Hexagon

A polygon with 6 sides.

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Heptagon

A polygon with 7 sides.

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Octagon

A polygon with 8 sides.

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Nonagon

A polygon with 9 sides.

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Decagon

A polygon with 10 sides.

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Parallelogram

A quadrilateral with opposite sides parallel.

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Rectangle

A parallelogram with 4 right angles.

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Square

A rectangle with 4 sides of equal length.

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Rhombus

A parallelogram with 4 sides of equal length.

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Trapezoid

A quadrilateral with exactly one pair of parallel sides.

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Types of Quadrilaterals

Parallelograms, rectangle, rhombus, trapezoid, square

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Similar Figures

Figures that have the same shape but not necessarily the same size.

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Corresponding Sides

A pair of sides from similar figures that are in the same position.

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Corresponding Angles

A pair of angles from similar figures that are in the same position.

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Congruent

To have the same measure.

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Perpendicular Lines

Two lines that intersect at a right angle

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Pi

The number that is the ratio of circumference of a circle to its diameter. 3.14159

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Circle

The set of all points in a plane that are the same distance from a given point called the center

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Radius

A line segment that has the center as one endpoint and a point on the circle as the other endpoint.

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Diameter

The distance across a circle through the center.

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Circumference

The distance around a circle.

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Right Triangle

A triangle that has one right angle.

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Hypotenuse

The side of a right triangle that is opposite the right angle. The longest side of a right triangle.

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Legs

The sides of a right triangle that form the right angle.

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Pythagorean Theorm

a2 + b2 = c2

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Volume

The measure of the amount of space that an object occupies or how much it will hold. It is measured in cubic units.

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Surface Area

The sum of the area of all the faces of a solid figure. SA is measured in square units.

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Face

The flat surface of a solid figure.

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Polyhedra

A solid that is bounded by polygons.

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Square Pyramid

A figure whose base is a square and whose other faces are triangles that share a common vertex.

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Rectangular Prism

A prism whose base is a rectangle.

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Cone

A solid that has a circular base, a vertex, and a lateral surface area.

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Cylinder

A solid figure with congruent circular bases that lie in parallel planes.

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Ordered Pair

(x, y) Where x and y are values representing a point on a coordinate plane.

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Rotation

A transformation that turns a figure a given angle and direction around a point.

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Reflection

A transformation that flips a figure about a line into its mirror image on the opposite side of the line.

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Translation

A transformation that slides each point of a figure the same distance in a given direction.

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Dialation

Enlarging or reducing a figure proportionally.

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Scale Factor

The common ratio of one polygon to a similar polygon.