I used this activity after showing the film: Night at the Museum: Battle of the Smithsonian (2009). This activity has a short paragraph about the Great Pyramids (which is talked about in the movie) and its relation to Pi (3.14). Then, it lists the ratios that always equal 2*Pi. There is also a diagram that shows the circular wheels that were used to measure the great pyramids. On the back, students are to measure the diameter of 5 circular objects, find the radius, perimeter, and circumference. After, they find the ratio of each object which will equal 6.28 every time. 6.28 = 2*Pi.
The objects I used are: a CD, a basketball and baseball on the bulletin board (flat), the bottom of a cup, and the bottom of the Smart Board eraser.
Students traveled around to stations and had 5 minutes at every station.