ATAR Notes: Forum

VCE Stuff => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematics => Topic started by: chuckjefster90 on July 21, 2010, 04:48:21 pm

Title: Need Help with Trig! :(
Post by: chuckjefster90 on July 21, 2010, 04:48:21 pm

Hey guys,
Firstly, I'm confused on what 25°15' actually means?
Secondly, Could you please help me out with these problems? Perhaps drawing the triangles on paint :s

1) Dylan is cycling along at 22 km/h on a straight country road. At one point he sees an old farmhouse 41° to the right from the road. Exactly 2 minutes later he is directly opposite the farmhouse. Calculate how close Dylan comes to the farmhous.
Answer: 0.64 km (640m)

2) From the top of a firespotting tower 210m high, the angles of depression of a fire moving towards the tower are observed to be first 12° and later 37°. How far did the fire travel between the two observation?
Answer: 710m

I will appreciate this a lot!
 :D

Title: Re: Need Help with Trig! :(
Post by: Russ on July 21, 2010, 05:01:45 pm

Degrees(o)/minutes(')/seconds(") is the notation. 60 minutes to a degree and 60 seconds to a minute. Kinda confusing but you get used to it.

Attached are two pictures for the questions. My notation/drawing is horrible, hope you got the idea though :)