Volume of a Regular Tetrahedron
Calculate the volume and surface area of a regular tetrahedron using its edge length.

| Volume V | |
| Surface Area S |
| \(\normalsize Regular\ tetrahedron\\ (1)\ volume:\hspace{50px} V={\large\frac{\sqrt{2}}{12}}a^3\\ (2)\ surface\ area:\hspace{10px} S=\sqrt{3}a^2\\\) |
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