The answer will vary slightly depending on assumptions: will the slabs have a space between them, and will you be cutting the slabs to fill fractions.
21 feet is equal to 14.2 of the 450 mm slabs. 19 feet is equal to 12.9 of the slabs.
To complete the rectangular area, 14.2 x 12.9 = 183 slabs.
No. Seven yards equal 21ft. 1 yd = 3 ft 7yd x 3ft/yd = 21ft
21 feet = 6.4008 metres
294
21ft
21ft by 10ft
12ft by 21ft is equal to 4m by 7m or 28 square meters.
No. Seven yards equal 21ft. 1 yd = 3 ft 7yd x 3ft/yd = 21ft
640.08 cm
3780lbs
21 feet is 7 yards.
21 feet = 6.4008 metres
38
294
21ft
That would be 63 square feet
17.7ft
21ft