##### Geometry Vocabulary

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created 3 years ago by mgort
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1

a closed two-dimensional shape with four straight sides

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Rhombus

a parallelogram with four congruent sides

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Square

a rectangle with four congruent sides

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Rectangle

a parallelogram with four right angles

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Parallelogram

a quadrilateral with two pairs of parallel sides

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Trapezoid

a quadrilateral with exactly one pair of parallel sides

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Isosceles Triangle

a triangle with at least two sides of the same length

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Scalene Triangle

a triangle with no sides of the same length

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Equilateral Triangle

a triangle with three sides of the same length

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Acute Angle

an angle that measures less than ninety degrees

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Right Angle

an angle that measures exactly ninety degrees

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Obtuse Angle

an angle that measures more than ninety degrees and less than one hundred eighty degrees

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Reflex Angle

an angle that measures more than one hundred eighty degrees

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Polygon

a closed two-dimensional shape made from line segments that do not cross each other

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Concave Polygon

a polygon for which you can connect two points inside the polygon with a line segment that passes outside the polygon

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Convex Polygon

a polygon that is not concave and all the inside angles have a measure less than 180 degrees

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Pentagon

a five sided polygon

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Hexagon

a six sided polygon

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Octagon

an eight sided polygon

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Regular Polygon

a polygon in which all sides and all angles are congruent

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Congruent

exactly equal in size and shape (sides, angles and figures can be congruent)

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Obtuse Triangle

a triangle with an obtuse angle

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Acute Triangle

a triangle with three acute angles

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Straight Angle

an angle that measures exactly one hundred and eighty degrees

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Perpendicular

lines or segments that intersect to form right angles (or a square corner)

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Parallel

lines or segments that stay the same distance apart and never meet or cross

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Horizontal

parallel to the horizon of the earth

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Vertical

perpendicular to the horizon of the earth

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Point

an exact location in space

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Line

a straight path that extends forever in opposite directions; named by two endpoints

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Line Segment

a part of a line with two endpoints; named by the two endpoints

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Ray

a part of a line with one endpoint that extends forever in one direction

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Vertex

the point on an angle or polygon where two lines or rays meet

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Intersecting

lines or segments that meet or cross at one point

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Right Triangle

a triangle with one right angle

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One-Dimensional

a figure with only one dimension, usually length

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Two-Dimensional

a figure with two dimensions, usually length and width

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Three-Dimensional

a figure with three dimensions, usually length, width and height

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Face

a flat surface of a three-dimensional figure

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Edge

a line segment where two faces of a three-dimensional figure meet

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Cube

a box-shaped solid figure that has six identical square faces

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Rectangular Prism

a solid figure with two rectangular bases that are congruent and parallel