
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
October 27th, 2009, 11:23 PM  #1 
Member Joined: Oct 2009 Posts: 98 Thanks: 0  Confusing trig problem need help
I'm really not sure where to start at all with this one. could be the fact that I've been staring at this homework all day long. Here's the diagram I need to express the area of triangle ABP as a function of . I also need to express the slope of line PB as a function of I know the formula to find the area of a circle, so it may be a matter of pluging in some part of the above identities into the formula to find out the answer, I also know the slope formula, but I am just having trouble deciding what to do. I have tried to find a part of the book that would help me with this one, but didn't find anything useful. (which I normally don't when doing homework from this instructor) I know all the trig identities and I have the unit circle memorized. Sometimes the way the problems are worded and put together confuse me, when it is usually something fairly simple. I don't like to ask for help when I haven't tried the problem, however on this one I don't really know where to start. maybe a hint or something. I'm not asking for the answer but maybe some guidance as to how I should approach this one. maybe i'll get some sleep and tackle this one in the morning. Thanks! 
October 27th, 2009, 11:41 PM  #2 
Member Joined: Oct 2009 Posts: 39 Thanks: 0  Re: Confusing trig problem need help
Area of the triangle is S=1/2 a h where a=AB (always!, your triangle is in the circle) and h=r sin(angledelta) But r=1 so S=1/2 AB sin(angledelta) Slope you can calculate knowing that sum of angles in the triangles gives 180, so angle PBA=(180angledelta)/2 (as triangle PAB is isosceles, PC=BC, where C is middle of the circle). 
October 27th, 2009, 11:55 PM  #3 
Member Joined: Oct 2009 Posts: 98 Thanks: 0  Re: Confusing trig problem need help
I'm still a little confused. what is angle delta? could you explain a little better what you mean? Thanks!

October 28th, 2009, 12:20 AM  #4  
Member Joined: Oct 2009 Posts: 39 Thanks: 0  Re: Confusing trig problem need help Quote:
angle delta is just angle you marked with greek character,. I am not sure how to write greek letters here. It is an angle PCB, where C is centre of the circle.  
October 28th, 2009, 01:27 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 18,841 Thanks: 1564 
In other words, ?. See this article regarding the area of a triangle. For the second problem, you can use the inscribed angle theorem (which gives the equation W300 used).


Tags 
confusing, problem, trig 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Confusing PreCalculus Problem. Can Anyone Counter This?  bboyinmartin  Algebra  3  January 19th, 2013 05:48 PM 
Confusing Word Problem  YoungMoustache  Elementary Math  1  September 20th, 2012 06:01 PM 
Confusing PEMDAS problem. Help for clarification  Francis410  Algebra  4  April 29th, 2011 08:07 PM 
Another confusing word problem  cherryperry  Elementary Math  1  May 29th, 2010 01:29 PM 
Confusing problem  beatboxbo  Calculus  5  October 25th, 2007 12:43 AM 