My Math Forum Semicircle and sines and many triangles wow
 User Name Remember Me? Password

 Geometry Geometry Math Forum

June 16th, 2015, 07:28 PM   #1
Senior Member

Joined: Jan 2015
From: USA

Posts: 107
Thanks: 2

Semicircle and sines and many triangles wow

Hi! Im not sure how to finish this problem. I am attaching what I wrote until my brain crashed can you help me? Is the first part correct? Also I have no idea how to solve the second part.

Thanx!
Attached Images
 semicircle.jpg (45.7 KB, 9 views) semicircle answer.jpg (12.2 KB, 8 views)

 June 16th, 2015, 08:24 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,599 Thanks: 2587 Math Focus: Mainly analysis and algebra If $ABCD$ is a rectangle with the four points in that order on a circle and $AD$ is a diameter, the area of the rectangle is zero because the angle $\angle{ABD}= \angle{ACD} = 90^\circ$.

 Tags semicircle, sines, triangles, wow

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post USAMO Reaper Geometry 2 March 21st, 2015 02:14 PM Albert.Teng Algebra 4 July 5th, 2013 11:45 AM johnny Algebra 6 March 7th, 2011 02:03 PM wfong Calculus 2 May 2nd, 2010 08:54 AM symmetry Algebra 5 February 2nd, 2007 04:53 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top