12 inches = 1 foot so 21 in = 1 foot 9 inches.
1386 sq ft
78.2 yards
7 yards is 21 feet.
1 yard is equivelant to 3 feet. 21*3=63 ft.
There are 3 ft. are in one yard 7 x 3 = 21 feet
How many cu ft
17 yards equals 51 feet which makes it lomger
3 feet = 1 yard 63 / 3 = 21 yards
12' * 21 ft = 12*21 sq ft = 252 sq ft.
No.
35 ft * 9 ft= 315 ft21 yard = 3 ft(1 yard)2 = (3 ft)21 yard2 = 9 ft2315 ft2 * (1 yard2/9 ft2) = 35 yard2
It equals 219 because there are 3 ft in a yd. :P