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14 Cards in this Set

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A=BH
area =base x height
parallelogram
A=S squared

area= side squared
square
A=1/2 BH

area = 1/2 base x height
triangle (regular)
side squared times the square root of 3 over 4.

sorry i couldn't make the formula with my computer :)
triangle (equilateral)
the square root of S (S-A) (S-B) (S-C)

the S stands for the semi perimeter which is the perimeter of the triangle divided by 2. The A,B,and C represent the lengths of the individual sides of the triangle.
triangle (all sides given)
1/2 D1 D2

1/2 of diagonal 1 x diagonal 2
rhombus
1/2 H(B1+B2)

1/2 of Height x base 1 + base 2
trapezoid
1/2 D1 D2

1/2 of diagonal 1 x diagonal 2
Kite
pie x radius squared
circle
degrees x (pie x radius squared)
-------------
360
sector
1/2 AP

1/2 of Apothem x perimeter
Polygon
pie x diameter
Circumference
degrees x (pie x diameter)
------------
360
Arc Length
the sector - the area of the triangle

if you saw one of these problems you would know what i am talking about.
Segment of a circle