Just add the measurements of the side to get the perimeter. However, if you want the easy way, here are the formulas:
Rectangle = [tex]2L + 2W[/tex], where length of the rectangle shall be multiplied by 2, and same with the width of the rectangle
Square = [tex]4S[/tex], where the S is the equal sides of it.
Triangle = [tex] S_{1} + S _{2} + B[/tex], where the subscript sides are the sides that finishes the triangle, and the base is the underline of the triangle.
Trapezoid = [tex] S_{1} + S_{2} + B_{1} + B_{2} [/tex], where the sides are the posts of the trapezoid, and the base is the top and under lines of it.
Parallelogram = same formula with Rectangle
Circle = technically, it's not perimeter, but it's CIRCUMFERENCE. Formula is:
[tex] \pi d[/tex], where pi is 3.14, and d is the diameter of the circle, which passes thorough the center in a straight line completely.
