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acute angle

an angle with measure greater than 0 degrees and less than 90 degrees

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acute triangle

a triangle in which all three angle measures are less than 90 degrees

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area

the measure in square units of the interior region of a plane figure or the surface of a three dimensional figure

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area of triangle

base times height and divide by two

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base

a special side of a polygon used to compute area

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composite figure

a shape made of several simpler figures

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diagonal

a segment that joins two vertices of a polygon and is not one of the sides

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division

inverse of multiplication

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equilateral triangle

triangle with all three sides the same length

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height

the perpendicular distance between two bases, or a vertex and a base

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hexagon

a polygon with 6 sides

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isosceles triangle

a triangle with at least two sides equal in length

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line segment

a part of a line with endpoints

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obtuse angle

an angle greater than 90 degrees and less than 180 degrees

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octagon

a polygon with eight sides

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parallel

two lines which never intersect and are the same distance apart

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parallelogram

a quadrilateral with opposite sides parallel

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pentagon

a polygon with five sides

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perpendicular

lines, segments or rays that intersect to form right angles

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polygon

a two dimensional closed figure with straight line segments connected end to end

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quadrilateral

a polygon with four sides

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ray

a portion of a line that has one endpoint and extends forever in one direction

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rectangle

a quadrilateral with four right angles

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regular polygon

a polygon with all sides congruent and all angles having the same measure

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rhombus

a quadrilateral with four congruent sides

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right angle

an angle with a measure of 90 degrees

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right triangle

a triangle with one right angle in it

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scalene triangle

a triangle with no two sides of equal length

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square

a quadrilateral with four congruent sides and four rigth angles

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square measure

units used to describe the measure of an area in the form of 1 * 1 unit squares

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subproblems

a problem solving strategy which breaks problems into smaller parts which must be solved in order to solve the original problem

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trapezoid

quadrilateral with exactly one pair of parallel sides

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triangle

a polygon with three sides

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vertex

the point at which two rays, line segments or lines meet.

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vertical angles

angles opposite each other when two lines intersect.

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