Use the Hero's formula: Let s = (a + b + c)/2. Then the area of the triangle equals
√[s(s - a)(s - b)(s - c)], where a, b, and c denote the sides of the triangle.
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Yes.
characteristics are: The lateral faces are triangles. it is three-dimensional. The lateral faces are not congruent.
Divide the polygon into triangles. Calculate the areas of the triangles and then sum these.
Only if they are congruent triangles
You will need to find the surface area of each face and add them together.