What is 45 divided 50.
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Observer E stands two feet away from the edge of the well D and looks down to the bottom of the well on the opposite side B.
By similar triangles, we have
Depth of the well = (6' radius/2 ft away)*6' high = 18 feet
By similar triangles, we have
Depth of the well = (6' radius/2 ft away)*6' high = 18 feet