The area of that cross section is the well known A = pi*R² which is colloquially pronounced as “pie are squared.” We will put aside the old joke that “Pie are not squared; pie are round” but we have ...

If you assume the density of air is 1.2 kg/m 3, what is the drag coefficient C for a coffee filter? You will need to find the cross sectional area of a filter. You can use the picture above.

In physics, a cross section describes the likelihood of two particles interacting under certain conditions. Those conditions include, for example, the number of particles in the beam, the angle at ...