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There is no standard for the size of a dressing room.
divide the beam into three rectangles, calculate the area of each rectangle and multiply it by length. then you get the volume of beam & finally multiply it by density
A ray is the beam of light from a distant object. The word is related to the Latin word radius. It has one dimension, length, from a start point to a finish point.
In a skew symmetric matrix of nxn we have n(n-1)/2 arbitrary elements. Number of arbitrary element is equal to the dimension. For proof, use the standard basis.Thus, the answer is 3x2/2=3 .
it has no dimension