My Math Forum  

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

Trigonometry Trigonometry Math Forum

LinkBack Thread Tools Display Modes
July 2nd, 2013, 07:23 PM   #1
Joined: Jul 2013

Posts: 1
Thanks: 0

Trigonometry - I don't understand the solution

Area of half a circle is (pi*r^2)/2

What happened to pi?

phi - sin(phi) ????
Attached Images
File Type: jpg trig forum picture.jpg (38.5 KB, 79 views)
Psyduck is offline  
July 2nd, 2013, 07:38 PM   #2
Senior Member
MarkFL's Avatar
Joined: Jul 2010
From: St. Augustine, FL., U.S.A.'s oldest city

Posts: 12,211
Thanks: 520

Math Focus: Calculus/ODEs
Re: Trigonometry - I don't understand the solution

What they have done to find the area of the shaded portion is to take the area of the circular sector, and subtracted the area of the isosceles triangle.

The are of the circular sector is:

The area of the triangle is:


MarkFL is offline  

  My Math Forum > High School Math Forum > Trigonometry

solution, trigonometry, understand

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
simple question, but can't understand the solution..... mathmaniac Advanced Statistics 17 February 25th, 2013 11:58 PM
I dont understand why this log. equation has no solution RealMadrid Algebra 6 June 5th, 2012 06:34 AM
Trigonometry: General Solution raniero Trigonometry 5 May 1st, 2011 02:31 PM
trying to make a solution (liquid solution...) problem... TreeTruffle Algebra 2 March 27th, 2010 01:22 AM
can someone help me understand this Williamson Calculus 5 July 13th, 2008 09:17 AM

Copyright © 2019 My Math Forum. All rights reserved.