Question 1192810
Angle of elevation at Junya is  90-64=26 degrees.


{{{highlight(cross(y/10.5=tan(26)))}}}


{{{highlight(cross(y=(10.5)tan(26)))}}}


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How long is the string?
r, length of the string
{{{10.5/r=cos(26)}}}

{{{r/10.5=1/cos(26)}}}


{{{r=10.5/cos(26)}}}