Posted 11 Mar 2013 Warm-up problem: Bisect the angles of a triangle. Describe the point(s) where each bisector first intersects one of the others. Now try this: Trisect the angles of a triangle. Describe the points where each trisector first intersects one of the others. 0 Share this post Link to post Share on other sites

0 Posted 11 Mar 2013 Do we have to name that point?if we have to name then the angle bisectors of a triangle meet at the incentre (i learned about it in school) and i dont know about the point where trisection meet.....i do hope you want us to find coordinates of the point... 0 Share this post Link to post Share on other sites

0 Posted 11 Mar 2013 Do we have to name that point?if we have to name then the angle bisectors of a triangle meet at the incentre (i learned about it in school) and i dont know about the point where trisection meet.....i do hope you want us to find coordinates of the point... You're right about the bisector case. But for the trisector case there is more than one point. In fact there are three places where a trisector of one angle first intersects a trisector of one of the other angles. And there is something special about those three points. 0 Share this post Link to post Share on other sites

0 Posted 12 Mar 2013 Do we have to name that point?if we have to name then the angle bisectors of a triangle meet at the incentre (i learned about it in school) and i dont know about the point where trisection meet.....i do hope you want us to find coordinates of the point... You're right about the bisector case. But for the trisector case there is more than one point. In fact there are three places where a trisector of one angle first intersects a trisector of one of the other angles. And there is something special about those three points. the three point where the trisectors meet lie on the same line... 0 Share this post Link to post Share on other sites

0 Posted 14 Mar 2013 Do we have to name that point?if we have to name then the angle bisectors of a triangle meet at the incentre (i learned about it in school) and i dont know about the point where trisection meet.....i do hope you want us to find coordinates of the point... You're right about the bisector case. But for the trisector case there is more than one point. In fact there are three places where a trisector of one angle first intersects a trisector of one of the other angles. And there is something special about those three points. the three point where the trisectors meet lie on the same line... Actually they are not collinear. That being the case, they form a triangle. So the OP really asks: what is special about the triangle formed by these three points? 0 Share this post Link to post Share on other sites

0 Posted 14 Mar 2013 ... this triangle is equilateral. (If my drawing was correct.) 0 Share this post Link to post Share on other sites

0 Posted 15 Mar 2013 (edited) ... this triangle is equilateral.(If my drawing was correct.) Correct. Good job. I wonder if there is a proof of this that is not overly complex? Edit: Well, No. I just found the proof, and it's not beautiful for its simplicity. You start with the Law of Sines, and 2 1/2 pages later you have a symmetrical expression for one side. "Do not try this at home." Edited 15 Mar 2013 by bonanova Comment on proof 0 Share this post Link to post Share on other sites

0 Posted 18 Mar 2013 ... this triangle is equilateral.(If my drawing was correct.) Correct. Good job. I wonder if there is a proof of this that is not overly complex? Edit: Well, No. I just found the proof, and it's not beautiful for its simplicity. You start with the Law of Sines, and 2 1/2 pages later you have a symmetrical expression for one side. "Do not try this at home." oh i am so sorry .....i mistook it for the eulers line....my bad... 0 Share this post Link to post Share on other sites

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Warm-up problem:Bisect the angles of a triangle.

Describe the point(s) where each bisector first intersects one of the others.

Now try this:Trisect the angles of a triangle.

Describe the points where each trisector first intersects one of the others.

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