Each edge of a regular tetrahedron is 3 cm, then its volume is –

A.$9\sqrt3\over4$ $cm^3$

B.$27\sqrt3$ $cm^3$

C.$4\sqrt3\over9$ $cm^3$

D.$9\sqrt3$ $cm^3$



[ A ]    a
right
[ B ]    b
[ C ]    c
[ D ]    d
Answer : Option A
Explanation :
The side of tetrahedron = 3 cm
The volume of tetrahedron $\sqrt2a^3\over12$ = $3^3\sqrt2\over12$
= $9\over4$ $\sqrt2$ $cm^3$

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