Physics
posted by Lili .
A surveyor measures the distance across a
straight river by the following methods: Starting directly across from a tree on the opposite
bank, she walks 249 m along the river bank to
establish a baseline. Then she sights across to
the tree. The angle from her baseline to the
tree is 38.2
How wide is the river?

tan 38.2 = d /249
d = 249 tan 38.2 = 196 m
Respond to this Question
Similar Questions

physics
A surveyor measures the distance across a straight river by the following method. Starting directly across from a tree on the opposite bank, she walks 90 m along the riverbank to establish a baseline. Then she sights across to the … 
physics
You want to swim straight across a river that is 76m wide. You find that you can do this if you swim 28 degrees upstream at a constant rate of 1.7m/s relative to water. At what rate does the river flow? 
physics
A surveyor measures the distance across a straight river by the following method. Starting directly across from a tree on the opposite bank, she walks d = 72 m along the riverbank to establish a baseline. Then she sights across to … 
PHYSICS
Sheena can row a boat at 2.91 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.54 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° … 
PHYSICS
Sheena can row a boat at 2.91 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.54 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° … 
vectors components
plz answer my question a river is 2 km wide and flows at 4km/h. a motorboat has a speed of 10 km/h in still water and heads out from one bank. a marina is directly across the river, on the opposite bank. if the motorboat heads directly … 
Physics_Vectors
You can swim at a speed v relative to the water. You are swimming across a river which flows at a speed V relative to the shore. The river is straight and has a constant width. A. If you wish to swim directly across the river, in what … 
physics
Sheena can row a boat at 2.90 mi/h in still water. She needs to cross a river that is 1.22 mi wide with a current flowing at 1.55 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° … 
physics
Sheena can row a boat at 3.13 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.75 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° … 
trigonometry
. A surveyor wishes to measure the distance across Pasig River. She sets up her transit at a point C on the bank of the river, and sights on a point B on the other bank directly opposite her. Then she turns the transit through a right …