Question 884506
{{{drawing(300,300,-2,8,-2,5,blue(line(0,0,0,2.8)),blue(line(0,0,7,2.8)),blue(line(0,2.8,7,2.8)),locate(3,3.5,R),locate(-1,2,1.5),locate(0.3,1,69))}}}
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From the diagram,
{{{cos(69)=1.5/R}}}
{{{R=1.5/cos(69)}}}
{{{R=4.186}}}
{{{D=2R}}}
{{{D=8.37}}}{{{m}}}