+0  
 
0
213
2
avatar

A swamp separates points L and R. To determine the distance between them, Ciana stands at L and looks toward R. She turns about 45° and walks 52 paces from L to point P. From P, she looks at R and estimates that LPR is about 60°. How many paces is it from L to R?
Include a diagram. 

 

An observation helicopter using a laser device determines that the helicopter is 1800 m from a boat in distress. The helicopter is 1200 m from a rescue boat. The angle formed between the helicopter and the two boats is 35°. How far apart are the boats? Include a diagram. 

 Jun 9, 2019
edited by Guest  Jun 9, 2019
 #1
avatar+111389 
+1

        

        P

       60

 

    52

 

L   45                75  R

 

Angle  LRP  =  180 - 60 - 45  =  180 - 105  =  75°

 

Using the Law of Sines, we have that

 

52/sin(75°) = LR / sin(60°)

 

LR  =  52*sin(60°) /sin (75°)  ≈  47 paces

 

 

cool cool cool

 Jun 9, 2019
 #2
avatar+111389 
+1

                                Helicopter

                                      35°

 

                   1200m                                              1800

 

Rescue Boat                    D                                  Distressed Boat

 

 

We  can use the Law of Cosines herer

 

D^2  =  1200^2 + 1800^2  - 2(1200)(1800)cos(35°)

 

D   =  sqrt [ 1200^2 + 1800^2 - 2(1200)(1800) cos (35°) ] =   1068 m

 

 

cool cool cool

 Jun 9, 2019

7 Online Users

avatar
avatar