54 + 90 = 144
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Making the assumption that the room is rectangular (as most are) then this question is the same as "what is the area of a rectangle 16x9 feet?" To find the area of a rectangle you multiply its length by its width, so we do: 16x9 =144 square feet or 16 square yards.
step 1- divide 16x9 rec into 1x1 grid and number them verticals in alphabets (A-Q), horizontals in numericals (1-10). A and 1 are at the same point step 2- now join points M1-M4-I4-I7-E4-E10 cut and rearrange to get 12x12 square