Answer :
The sine of the angle between the ground and the line that connects the top of the shadow to the top of the tree is 10.37 degree
The side-angle-side theorem
According to the theorem above, the sine of the angle between the ground and the line that connects the top of the shadow to the top of the tree is given as;
sin theta = opposite/hypotenuse
Given the following
oppoiste side = 9feet
Hypotenuse = 50 feet
Substitute
sin theta = 9/50
theta = arcsin(0.18)
theta= 10.37 degrees
Hence the sine of the angle between the ground and the line that connects the top of the shadow to the top of the tree is 10.37 degrees
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