# How do I calculate a cross-sectional area?

To calculate a cross sectional area, you apply the same formula as for calculating the area of two-dimensional surfaces. The choice of formula depends on the shape. To find the area, you need a formula and relevant measurements. For example, to find the cross-sectional area of a box, the area is equal to (length X width). For formulae on area, visit: http://www.ask.com/wiki/Area
Q&A Related to "How do I calculate a cross-sectional area?"
 1. Identify the axis of symmetry. For many applications, this will be the longest axis or the longitudinal axis. 2. Identify the shape projected onto a plane that passes through the http://www.ehow.com/how_4913182_calculate-cross_se...
 If I am correctly understanding the question. You are simply looking for the area of a circle or pi * R^2 or pi/4 * D^2. - The formula above is correct for the planar cross section http://wiki.answers.com/Q/How_do_you_calculate_the...
 First measure across a circle to find its diameter. Half of the diameter is equal to the radius. The area of a circle is equal to 1/2 x pi (˜ 3.14) x radius squared. http://www.ask.com/web-answers/Science/Mathematics...
 You could integrate the resistance of thin-slices of the object: This is essentially a combination of the fact that series resistances add and the formula for the resistance of an http://www.quora.com/Electrical-Engineering/How-do...