4
Om obtuse, scalene
Obright, scalene
Oc, right, isosceles
Od, right, equilateral
![4 Om obtuse scalene Obright scalene Oc right isosceles Od right equilateral class=](https://us-static.z-dn.net/files/d91/6f7938ab02645154ca4ba14e832720bc.png)