Rope slack

Between two streets 20 m away give the lamp, which is in the middle and hanging 60 cm bellow the taut rope. Can be done with 20.5 meters rope?

Result




Solution:

(x/2)2=(20/2)2+0.62 (x/2)2=100.36 x/2=10.0179838291 x=20.0359676582 m x<20.5 m 



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