Final answer:
The fraction used for shrink in a 45-degree bend can be calculated using trigonometry. The formula is 1 - sin(angle). For a 45-degree bend, the shrink fraction is approximately 0.29.
Step-by-step explanation:
The fraction used for shrink in a 45-degree bend can be determined using trigonometry. When a material is bent at a certain angle, the length of the material in the bent section is shorter than the original length. This shrink can be determined by finding the sine of the bend angle.
The formula to calculate the shrink fraction is: Shrink Fraction = 1 - sin(angle)
For a 45-degree bend, the shrink fraction would be:
Shrink Fraction = 1 - sin(45) = 1 - 0.7071 = 0.2929 or approximately 0.29.