What type of triangle does Euler's nine point circle work with?

[geometry]

I'm doing a project on the nine point circle and i need to know what type of triangle it works with. I tried constructing it but it didn't work with an isoscoles or a obtuse triangle, but a website said it works with all triangles, can anyone help?

 

[Allegro]

Nine point circle

Hello Geometry,

See http://mathworld.wolfram.com/Nine-PointCircle.html

I think the sketch with four points A,B,C and D,four ninepoint circles ,two obtuse and two acute triangles are the ones you'r looking for.

Regards.

 

[selfAdjoint]

The nine point circle works with general triangles. Maybe you're drawing something wrong.