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The base of a right pyramid is an equila...

The base of a right pyramid is an equilateral triangle of side `4cm` .The height of the pyramid is half of its slant height. The volume of the pyramid is:
A) `(8sqrt(3))/(9)cm^(3)`
B)`(4sqrt(3))/(9)cm^(3)`
C)`(16)/(3)cm^(3)`
D)`(18)/(sqrt(3))cm^(3)`

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