###
30-60-90 Special Right Triangle

a, 2a, a√3

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45-45-90 Special Right Triangle

a, a, a√2

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Polygon

closed, 2D figure whose sides are segments (straight) and intersect only at their end points (vertex; vertices)

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Trapezoid

a quadrilateral with exactly one set of parallel sides

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Parallelogram

a quadrilateral with exactly two sets of parallel sides

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Rhombus

a parallelogram with four congruent sides (not necessarily 90° angles)

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Square

a quadrilateral with two sets of equal sides and four 90° angles

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Rectangle

a quadrilateral with two sets of equal sides and four 90° angles

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Area

measurement of space inside a figure

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Area of a Parallelogram

Area=base x height

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Area of a Trapezoid

(only 1 set of parallel lines) A=(b1+b2/2)h

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Circumference (definition)

measurement around circle

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Circumference (formula)

circumference=diameter x ∏ (pi)

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Prism

has 2 congruent bases that are parallel (can be any polygon) All remaining faces (sides) are rectangles

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Cylinder

a solid with 2 congruent circular bases that are parallel to each other

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Surface area (S.A.)

the sum of the areas of the faces of a solid

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Area of a triangle

A=1/2 bh

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Pythagorean Theorem

a2+b2=c2

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Equilateral

congruent sides and angles

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Isosceles Triangle

has 2 congruent sides

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Scalene Triangle

has NO congruent sides

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Perimeter

the sum of the measurements of each face of a polygone

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