Volume of a Pyramid

How do you find the volume of a square pyramid with base edges of 21 feet
and a height of 18 ft?

Volume of a Pyramid
= (1/3) x (area of base) x height
= 1/3 x (21 x 21) x 18  {the base is a square with an area of 21 x 21} 
= 1/3 x 441 x 18  {multiplied 21 by 21}
= 1/3 x 7938  {took 441 x 18}
= 2646 ft³  {divided 7938 by 3}

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