Question

A biologist wants to know the width w of a river to properly set instruments for an experiment. From point A, the biologist walks downstream 100 feet and sights to point C (see figure). From this sighting, it is determined that
𝜃 = 50°.
How wide is the river? (Round your answer to one decimal

Answer 1

you don't say how 𝜃 is measured, but if C is directly across from A, and the width is w, then
w/100 = tan𝜃
or
w/100 = cot𝜃