29 x 39 = 1,521 (square feet).
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The length is 9 feet and the width is 4 feet Check: 9 times 4 = 36 square feet
Length times width in feet will give the square footage.
When you multiply length times width in feet, you have square feet.
If the room is rectangular - the usual case - multiply the length times the width. If length and width are in meters, the area will be in square meters; if length and width are in feet, the area will be in square feet, etc.
If you only have square feet, you won't be able to find the height, unless you're mistaking height for length. Area in square feet of a quadrilateral is width times length. To find the length, divide the area by the width.