Final answer:
The center to face measurement of a 4" short radius 90° elbow is 2 inches.
Step-by-step explanation:
The center to face measurement of a 4" short radius 90° elbow can be calculated using trigonometry. Since it is a 90° elbow, the center to face measurement is equal to the radius of the elbow. The formula to calculate the center to face measurement is:
Center to face measurement = Radius of the elbow x sin(45°)
Given that the radius of the elbow is 4", plugging it into the formula:
Center to face measurement = 4" x sin(45°) = 4" x 0.7071 = 2.828 inches
Therefore, the correct answer is d) 2 inches.