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the width would be 1 unit
lineal is the length board feet is 1ft wide X 1 ft long X 1 inch thick = 1 board foot
The diameter of a 10 cm wide circle is 10 cm. The diameter is just how wide it is. The radius is 1/2 X diameter. 1/2 X 10cm = 5 cm.
10 x 4 x 3 = 120ft3
Area = length x wide = x(3x + 1) = 30x(3x + 1) = 303x2 + x = 303x2 + x - 30 = 0(3x + 10)(x - 3) = 03x + 10 = 0 or x - 3 = 0x = -10/3 = -3 1/3 or x = 3