The answer will depend on the units used. It should be obvious to anyone that the square footage of 29 metres by 6 metres will be somewhat different from 29 inches by 6 inches!!
6' x 29' = 174 square feet
435 square feet (just multiply 29 x 15)
54 square feet (6 x 9 = 54)
4' X 6= 24 square feet.
29 x 39 = 1,521 (square feet).
6' x 6' = 36 square feet.
6' x 20' = 120 square feet.
I assume you mean,6 feet X 7 feet= 42 square feet===========
42 square feet
5 x 6 = 30 square feet
82' x 6' = 492 square feet.
The square footage is 6 x 25 or 150 square feet.