Perimeter 
Polygon 
P = sum of the lengths of all sides 
Rectangle 
P = 2(l + w) 
Circumference 
Circle 
C = 2r, or C = d 
Area 
Rectangle 
A = lw 
Square 
A = s^{2} 
Parallelogram 
A = bh 
Triangle 
A = (1/2)bh 
Trapezoid 
A = (1/2)h(b_{1} + b_{2}) 
Circle 
A = r^{2} 
Volume 
Cube 
V = e^{3} 
Prism 
V = Bh 
