You can put this solution on YOUR website! .
Find the surface area of a when the slant height is 10 in?
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Probably, you mean a regular tetrahedron which has all edges congruent?
(Otherwise the question has no a unique answer . . . ).
Why do not formulate it directly, clearly and explicitly? Why I should do it instead of you?
Such a tetrahedron has four faces, and each of them is a regular triangle with the altitude of 10 in.
Hence, the base of each such a triangle is of in. (It is the length of the edge of the regular tetrahedron).
Then the area of a single triangle (of a single face) is .. = square inches.
