To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
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split the wedge into a triangle and a and rectangle or square. Then calculate the surface area for each shape and add them together
Surface area of a shape depends on what shape you have in mind.
because for a 3d shape you use surface area which is the same except you calculate the area of each side and then add them together
If it's just the front surface of a box then it's simply a 2D shape, the area can be calculated by multiplying the length by the width. Answer will be in units squared.
The most direct way to calculate the area of an irregular shape is to superimpose it on graph paper, and then count the number of complete squares that it covers, and for squares that are only partially covered, estimate how much of the square is covered to the nearest simple fraction (a half, a third etc.). If you want the surrounding area rather than the area of the shape itself, you could calculate the total area and then subtract the area of the shape.