There is insufficient information for us to answer this question. Please edit the question to include more context or relevant information. What aspect of the archway do you want to calculate? The area, the radius of curvature? These will depend on whether the arch is circular or of some other - unspecified - shape.
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a monumental archway
A complete door consist of subframe,frame,architrave and lock with door handle
you multiply LXW
They have to calculate the weight of the door so they know how heavy it is.
The area of each side of the door is 20 square feet. We can't calculate the area of the edges until we know the door's thickness.