Multiply length by width. 9*12=108 sq ft.
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(9-ft x 12-ft) = 108 square feet / (9 square feet per square yard) = 12 square yards======================Another method:9-ft = 3 yards12-ft = 4 yards(3yd x 4yd) = 12 square yards
9*13 = 117 square feet
99 square feet !
You multiply the length by the width to find the area. So, if a room was 12 feet long by 9 feet wide you would work out the area as 12 feet x 9 feet = 108 square ffeet.
A 12' x 9' room has an area of 12 square yards.