129 cm2 = 19.995 inches2
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129 sq centimeters = 19.99504 sq inches.
What units are 108 and 129 in
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).
The square root of 129 is 11.3578167
It is not clear from the question what "129 inches size" refers to. Is it one side of a tile, its perimeter, its diagonal?