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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 (SA) (SB) (SC)
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
