Steel pipe is made by pulling the molten steel through a cone before its welded together. Twenty one feet is the length at which the newly formed steel would hold a straight seam wield but still be able to be formed into pipes.
2.8 cubic feet is about 21 gallons.
75,600 seconds.
The elevation of Rome is 20 meters or 70 feet. Rome is one of the oldest cities in the world.
A person falling from a height of 25 feet will reach a speed of approximately 31 feet per second (or 21 miles per hour) when they hit the ground. This speed is reached due to the acceleration caused by gravity.
An oven that is 4.4 cubic feet would have interior dimensions of approximately 21 inches in width, 17 inches in depth, and 19 inches in height. This size is considered medium to large and can accommodate a variety of dishes and cookware.
Steel pipe commonly comes in 21' lengths.
21`foot
26*21 = 546 sq feet
21 feet is equal to 7 yards, or 6.4008 metres, or 640.08 centimetres.
pi * (6in^2) = 113.097336 sq in. (113.097336 (sq in)) * 21 200 feet = 16 650.4411 cu ft http://www.google.com/search?q=113.097336sq+in+*+21200+feet+in+cu+ft
21 feet = 6.4 meters.
21
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.
21-30 feet long
7 yards is 21 feet long.
21-ft x 22-ft = 462 ft2
21 feet long because 3 feet is in a yard so 3x7 is 21.