An observer stands on the edge of a 375 m high cliff. Below him is a river. He estimates that the angle of depression to the near bank of the river is 80° and the angle of depression to the far bank is 60°. Find the width of the river to the nearest metre.

Answer 1

In another attempt to determine the height of the flagpole, a metre stick was placed vertically beside the flagpole. When the flagpole’s shadow was 36.72 m long, the metre stick’s shadow was 3.06 m long. Find the height of the flagpole.

Answer 2

First one: triangle
second one: triangle

proportions and trigonometry

Answer 3

Tan 60 = h/d .
Tan 60 = 375/d,
d = ?

Answer 4

h = (36.72m/3.06m) * 1m =