Rectangular perimeter = (length+width) *2 square perimeter = side length *4 rectangular area = length * width square area = side length * company commander.

Triangle area = bottom * height /2 trapezoid area = (upper bottom+lower bottom) * height /2 rhombus area = bottom * circumference of high circle = diameter * upright = radius *2* upright =2 upright R area = upright r*r, that is, square upright with upright radius = 3.14/kloc-0.