490 sq feet = 490/9 = 54.44... sq yards.
3 feet = 1 yard so the answer is 1,470 feet.
5 inches is 5/12 feet. So volume of concrete required is 490 x 5/12 = 204.16 cubic feet There are 3 x 3 x 3 = 27 cubic feet in a cubic yard. Therefore the volume required is 204/27 = 7.56 cubic yards (say 8 cubic yards). A useful example of estimating foundations and floor is at `Estimating - Foundation and Floor' http://www.inquirewithin.biz/Vol2/Estimating/estimating_foundations.htm
490 cm is 16.1 feet.
200 feet x 490 feet is 2.25 acres.
490 square feet.
490 square feet.
490 lbs per cubic foot
35 × 14 = 490 square feet
At North Star they said that the Sun is 490 billion feet away from the earth
1,607.61 feet or 1,607 feet 7.3 inches.
It is about 490 feet tall.