Question 260255
Draw a triangle pointing up and label bottom left vertex A, bottom right vertex B and top vertex F.
put 20 as the distance between A and B. place a 40 in angle A and a 60 in angle B. Looking carefully at the picture, I see we can use law of sines to solve for AF.
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step 1 - set up the following low of sine proportion:
{{{(20/sin(80)) = (AF/sin(60))}}}
step 2 - cross multiply to get
{{{20*sin(60) = AF*sin(80)}}}
step 3 - solve for AF in calculator ready form as
{{{20*sin(60)/sin(80) = AF}}}
step 4 - estimate AF as
{{{20*.866/.9848) = AF}}}
and then
{{{AF = 17.587}}}
or about 17.6 miles