Find the volume of the solid with base R, where R is the region enclosed by the functions f(x) = √x - 2 and g(x) = 1/2x - 2, and where each cross section perpendicular to the x-axis is a semi-circle with diameters extending through the region R. Round to the nearest thousandth.
(a) 1.234
(b) 4.567
(c) 7.890
(d) 10.123
