A right angle is defined as an angle that measures 90 degrees. One-half of a right angle is equal to 90 degrees / 2 = 45 degrees.
Three and one-half of a right angle is equal to 3 right angles + 1/2 of a right angle = 3 * 90 degrees + 45 degrees = 270 + 45 = 315 degrees.
Therefore, the number of degrees in three and one-half of a right angle is 315. The correct answer is (b).
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