If the length of each edge of a regular tetrahedron is ' $a$ ', then its surface area is
A$\sqrt{3} a^2$ sq. units
B$3 \sqrt{2} a^2$ sq. units
C$2 \sqrt{3} a^2$ sq. units
D$\sqrt{6} a^2$ sq. units
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C$2 \sqrt{3} a^2$ sq. units
C
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Each side of a triangle is multiplied with the sum of the squares of the other two sides. If the sum of all such possible results is 6 times the product of the sides, then the triangle must be