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123456 x 17=2'098'752
2 x 3 x 7 x17 x174
Assuming 17x17 refers to measurement in inches, a 17"x17" tile will cover 17/12 x 17/12 sq ft = 2.0069 sq ft Then covering 427 sq ft will require 427/2.0069 = 212.76 = 213 tiles. This number assumes there are no breakages, there is no wastage and that every offcut is used.
Each 17"x17" tile will cover 17/12 x 17/12 sq ft = 2.0069 sq ft Then covering 255 sq ft will require 255/2.0069 = 127.06 = 128 tiles. This number assumes that the shape is well-behaved (there are no wriggly edges or narrow left-over bits). that there are no breakages and that most off-cuts are used. In real life, therefore, you should allow at least 5% for wastage.
we know by tringometry , sin x = opp side /hypotenuse . sin 60 = opp side /17. sqrt (3)/2 =oppside /17 . opposite side = 1.732 X17 /2 =14.7 m.