Question 1203428
B is 100 feet from point A.
C is assumed to be directly across the river.
ABC right triangle is assumed.
AB is 100 feet long on one side of the river.
BC is perpendicular to AB with point C on the other side of the right.\
angle CAB is 58 degrees.
tan(CAB) = opposite / adjacent = BC / AB = BC / 100
since CAB is 58 degrees, you get tan(58) = BC / 100
solve for BC to get BC = 100 * tan(58) = 62.48693519 feet.
that's the width of the river.
here's my diagram.
if it's not accurate, please send an accurate picture.
<img src = "http://theo.x10hosting.com/2023/083002.jpg">