Explore π by following these steps.

✓ 1. The number π is the ratio of the and of a circle.

✓ 2. One way of estimating the value of π is by randomly dropping needles of length l on a sheet of paper containing parallel lines that are a distance l apart. The probability of a needle landing on a line is 1/2π, or 0.6366. If 100 needles are randomly dropped, how many needles would be expected to cross lines?

✓ 3. Press Continue to run the simulation of Buffon's Needle.

✓ 4. In the simulation, %1 needles landed across lines. The value of π can be estimated by dividing 200 by the number of needles that crossed lines in the simulation. In this example, π = 200 / %1 = %2.