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None!!!! You misunderstand!!!! Inches is a LINEAR measure, Square Feet is an AREA measure. However, in 1 sq. ft. there are 12 ins X 12 ins = 144 sq. ins. So multiply 29 sq.ft. X 144 sq.ins = 4176 sq. inches. (NOT inches).
An inch is a measure of length. A square inch is a measure of area. An area of 50.14 sq ins could be the area of a rectangle with a length of 10 inches and a width of 5.014 inches. The area is length x width = 10 x 5.014 = 50.14 sq ins Or it could be a square with a side length of 7.08 inches. Or, the area of a circle with a radius of almost 4 inches.
Area of circle = pi x radius squared where pi = 3.1416 radius = diameter/2 = 4/2 = 2 ins Area = 3.1416 x 2 x 2 sq.ins. = 12.5664 sq ins
16 x 16 = 256 Sq Ins /144 = 1.78 sq ft per brick 121 / 1.78 = 68 Bricks but I would buy 3 or 4 extra depending on cuts you need to make.
You misunderstand !!! 'Square Feet' is a measure of AREA. 'Inches' is a measure of a LINE(Distance). However, if you mean 'square inches' . Then :- 1 sq ft. = 12 ins x 12 ins = 144 sq.ins. So in 36 sq.ft. there are 144 x 36 = 5184 sq.ins.