Using a density of air to be 1.21kg/m3, the diameter of the bottom part of the filter as 0.15m (assume circular cross-section), and the power fit of your Trendline equation, calculate the drag coefficient. Solve for it first (see video) and then plug in the values.

The  drag coefficient is    

Explanation:

From the question we are told that

     The density of air is  

     The diameter of bottom part is  

The  power trend-line  equation is mathematically represented as

let assume that the velocity is  20 m/s

Then

The drag coefficient is mathematically represented as

Where  

      is the drag force

      is the density of the fluid

        is the flow velocity

       A is the area which mathematically evaluated as

substituting values

Then