Question 972864
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The cables will be the hypotenuses of right triangles formed by:
a=height=30yds-6yds=24yds
b=distance from base=10yds
c=cable length for one support
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{{{a^2+b^2=c^2}}}
{{{24^2+10^2=c^2}}}
{{{676=c^2}}}
{{{sqrt(676)=c}}}
{{{26yds=c}}}
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One support is 26 yards so total length needed is 3(26yds)=78 yards