My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
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!
suomik1988 is offline  
 
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=(180-angledelta)/2 (as triangle PAB is isosceles, PC=BC, where C is middle of the circle).
W300 is offline  
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!
suomik1988 is offline  
October 28th, 2009, 12:20 AM   #4
Member
 
Joined: Oct 2009

Posts: 39
Thanks: 0

Re: Confusing trig problem need help

Quote:
Originally Posted by suomik1988
I'm still a little confused. what is angle delta? could you explain a little better what you mean? Thanks!

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.
W300 is offline  
October 28th, 2009, 01:27 AM   #5
Global Moderator
 
Joined: Dec 2006

Posts: 17,911
Thanks: 1382

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).
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

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 Pre-Calculus 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





Copyright © 2017 My Math Forum. All rights reserved.