An Euler Line Area Ratio

Problem

Let H,PH,P be two points in the plane of ABC\triangle ABC, distinct from A,B,CA,B,C, and write a=PA\vec a=\overrightarrow{PA}, b=PB\vec b=\overrightarrow{PB}, c=PC\vec c=\overrightarrow{PC}, h=PH\vec h=\overrightarrow{PH}. Suppose

ab+ch=bc+ah=ca+bh,\vec a\cdot\vec b+\vec c\cdot\vec h=\vec b\cdot\vec c+\vec a\cdot\vec h=\vec c\cdot\vec a+\vec b\cdot\vec h,

and AH=1|\overrightarrow{AH}|=1, BH=2|\overrightarrow{BH}|=\sqrt 2, BC=3|\overrightarrow{BC}|=\sqrt 3. Let OO be the circumcenter of ABC\triangle ABC. Find the ratio of the areas of AOB\triangle AOB, BOC\triangle BOC, AOC\triangle AOC.

Answer

Solution

Difficulty8/10
Topicsplane geometry, Law of Sines, Triangle Geometry, vectors

Whiteboard

Your sketch is saved only in this browser. To share it, export your drawing as an image (whiteboard menu → Export as → PNG), then upload that image in the comments below.

Discussion

Ask questions, share alternate solutions, and use LaTeX freely.

0 comments
Log in to join the discussion.

No comments yet.