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Mathematical sketch
If you brought photos, you wouldn't have to say so much.

The first solution 2

Draw a line perpendicular to the river after point A (this line is called capital A), and the intersection of the two lines is the dock location.

Solve again 1

Draw a straight line perpendicular to A through point A (this line is called capital B), and B is the road parallel to the river.

Re-solution 3

This question mainly depends on you, because there is no plan and no unit.

A is the radius. Draw this circle with a compass, then calculate the actual distance (that is, the actual length of A) to get C(C is the actual length of A), and multiply the square of C by pi to get the area.