129 inches = 10.9 feet or 10 3/4 which is 10.75
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10 feet 9 inches !
It is not clear from the question what "129 inches size" refers to. Is it one side of a tile, its perimeter, its diagonal?
129 sq centimeters = 19.99504 sq inches.
Area is the product of length and width of the room. It is easier to calculate in square inches when the dimensions are a mixture of feet and inches, and then divide the product by 144 to convert it to square feet. 12'2" x 10'7" = 146" x 127" = 18,542 square inches = 129 square feet (rounded).
129 cm2 = 19.995 inches2