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If the length of each edge is s cm then the area of each face is sqrt(3)*s/4 square cm.

Since there are 4 such faces, the total area is sqrt(3)*s cm2.

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Q: How do you find lateral area of a regular tetrahedron?
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What is the formula to find the surface area of a tetrahedron?

It depends on whether or not the tetrahedron is regular. There is nothing in the question to indicate that it might be regular. In that case the easiest way to calculate the surface area is to sum the areas of each of its 4 faces.


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