Answer:
the length of RS to the nearest tenth of a foot is 240.6ft
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The length of CD is 7-3=4.
Therefore, if we dilate by a scale factor of 3, the length is 4(3) = 12
We know that According to Law of Sines :

where A - B - C are the Angles of the Three Vertices of the Triangle
a - b - c are the lengths of the Opposite sides of the Angles of the Respective Vertices A - B - C
From the Given Triangle we Can Notice that :



SinC = 0.682

C = 43°