a) 12.39m
b) 11.39m
c) 13.39m
d) 10.39m
Answer: b
Explanation: Lc = 2x + \(\frac{π}{2}\)(d1+d2)+\(\frac{(d1+d2)^2}{4x} \)
= 2*4 + \(\frac{π}{2}\)(1.25+0.75) + \(\frac{(1.25+0.75)^2}{4*4} \)
= 11.39m.
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