In the case where you require the projected area of a model, to calculate wind resistance for example, you can create a sketch on the front surface. When you select the loop of the sketch (right click > Select Loop) and open the measurement tool, you get the enclosed area of that sketch.
Are you trying in Drawing view or model. In either case select the face and click on measure tool or vice versa.
views include diameters .as calculating the flat face of a diameter
thank you very much I 'm measuring wind resistance to a mechanism that was manufactured in a helicopter,
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