Important Formulas

    Area of a rectangle     A = b h    
    Area of a triangle     A = b h / 2
    Area and circumference
    of a circle		     A = r2
    C = d or 2r
    Volume of a rectangular
    prism (box)		     V = l w h    
    Sum of the angles
    in a triangle		     Sum = a + b + c = 180o    
    Area of a trapezoid     A = (b1 + b2) h / 2
where b1 and b2 are the 2 bases and h is the height