This activity has students measure the area and perimeter of their hands (an irregular shaped object).
First, students trace their hand on graph paper. Next, they count the number of boxes inside of their hand for the area. Then, they cut a piece of string and re-trace their hand with the string. Lastly, they lay the string flat and measure it with a ruler. This is the perimeter.
Afterwards, I have students color and decorate their hand, cut it out and write their measurements on it.