Answer:
The shortest possible length for the bypass road is 1,275 miles
Step-by-step explanation:
see the attached figure with letters to better understand the problem
we know that
If two figures are similar, then the ratio of its corresponding sides is proportional and its corresponding angles are congruent
In this problem triangles ABC and CDB are similar by AA Similarity Theorem
so
[tex]\frac{BC}{DB}=\frac{AC}{CB}[/tex]
substitute the given values
[tex]\frac{850\sqrt{3}}{DB}=\frac{1,700}{850\sqrt{3}}[/tex]
solve for DB
[tex]DB=({850\sqrt{3})^2/1,700[/tex]
[tex]DB=1,275\ miles[/tex]
therefore
The shortest possible length for the bypass road is the distance DB (perpendicular distance from right angle to the hypotenuse triangle ABC)