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Since we can only see half of the arrow pattern, we can assume that the full arrow will be a reflection of the shown pattern.
The given pattern can be divided into two right triangles and two rectangles. The width of the arrow is 8 feet, and the height is 5 feet.
The area of one right triangle is (1/2) * base * height = (1/2) * 5 * 2 = 5 square feet.
The area of one rectangle is base * height = 8 * 2 = 16 square feet.
Since there are two right triangles and two rectangles, the total area that will be painted is:
(2 * 5) + (2 * 16) = 10 + 32 = 42 square feet
Therefore, the amount of area in square feet that will be painted is 42 square feet.