These notes are word documents so you can modify if you'd like. These are notes on the perimeter of polygons. I start of with pretty basic problems, then have them solve for a missing side if given the perimeter and side of a rectangle. The last two perimeter problems are algebra based in that students must solve for x first knowing the perimeter and the sides in relation to x. For example, what if the sides of a triangle are x, 2x, and 2x+4 with a perimeter of 54. Find x and then find one of the missing sides.