What is the formula for volume of a square?

Volume is measured of the objects which are three-dimensional .. And square is just a shape , hence it doesn't have any formula for volume .
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If you were tryna ask about cube , the formula for cube is s^3
Where s is the side of the cube

a = 150

Step-by-step explanation:

The sum of the internal angles of an octagon is 1080°.

(There are four and 4 , they sum to 1080°)

Hope this helps :)