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<p>also called <b><i>quadratic drag.</i>' </b></p>

<p>The derivation of this equation is presented at .</p>

<p>The reference area A is often the <a href="page.php?w=orthographic_projection">orthographic projection</a> of the object, or the frontal area, on a plane perpendicular to the direction of motion. For objects with a simple shape, such as a sphere, this is the <a href="page.php?w=cross_section_%28geometry%29">cross sectional</a> area. Sometimes a body is a composite of different parts, each with a different reference area (drag coefficient</p><p>
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