12 inches = 1 foot.
19.5 ft = 12 x 19.5 = 234 inches
8 inches = 8/12 = 2/3 or 0.6667 feet
If the measurements are in feet then 19.5 x 2/3 = 39/3 = 13 square feet
If the measurements are in inches then 234 x 8 = 1872 square inches.
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Area of a circle = pi x r(squared) Area = 2.1415927 x 8 (squared) Area = 2.1415927 x 64 Area = 137.06 inches
Let the width be x inches. So, the length will be 'x+8' inches. Area will be (x)*(x+8) sq. inches. This implies , (x)*(x+8) = 108 x2 + 8x - 108 = 0 Solve for x and you get the width.
An 8 x 13 inch paper has a surface area of 104 square inches.
8 x 3 = 24 square inches
4 . 8 =32 A cylinder is round and its circular area is dependant on one dimension only - its diameter or radius. If the diameter is 4 inches then the area is Pi/4 x 42 = 4*Pi If the diameter is 8 inches then the area is Pi/4 x 82 = 16*Pi If you needed the surface area and the diameter was 4 inches and the height was 8 inches, then the surface area would be (circumference) x height = (Pi x 4) x 8 = 32*Pi square inches. Of course Pi = 3.14159 to the nearest 5th decimal.