1) Triangle 30°, 130°, 20° - OBTUSE TRIANGLE
2) Triangle 60°, 60°, 60° - ACUTE TRIANGLE
3) Triangle 55°, 90°, 35° - RIGHT TRIANGLE
4) Triangle 35°, 110°, 35° - OBTUSE TRIANGLE
Obtuse triangles are triangles which has an angle that is more then 90°.
Right triangles are triangles that has 90° angle
Acute triangles are triangles that has all angles below 90°