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7 Cards in this Set

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Polygon exterior angles

Add up to 360sum

Sum of interior angles of polygon

(n-2)x180



(n is number of sides of polygons)

Regular polygon properties

Equal sides & equal angles

Regular polygon exterior angle formula

360/n

Compound Interest

A = p ( 1 + r/100 )n




Amount


Principal


Rate


number of years

Trapezium

Area: 1/2 (a+b)h


Perimeter: sum of all sides

cosine rule

To find length (1 angle/2 sides):


a2 = b2 + c2 - 2bc (cos A)



To find angle (3 sides)


cos A = (b2+c2-a2) / 2ab