Note that we have two right triangles
The one on the left has legs of 5 and (15 - 3) = 12
And the rope length of this section is the hypotenuse and its length is
sqrt [ 12^2 + 5^2 ] = sqrt [ 144 + 25 ] = sqrt [169 ] = 13 m
And the one on the right has legs of (14 - 5) = 9 and (15 - 3) = 12
And the rope length of this section is the hypotenuse and its length is
sqrt [ 9^2 + 12^2 ] = sqrt [ 81 + 144 ] = sqrt [ 225 [ = 15 m
So......the total length of the rope = 13 + 15 = 28 m
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