Scalene Triangle: Here no sides or angles are the same.
Isosceles Triangle: Here two sides and angles are same.
Acute Triangle: Here all three angles are less than 90º.
Obtuse Triangle: Here one angle is greater than 90º.
Equilateral Triangle: Here all sides & angles are the same.
Right Triangle: Here one angle is equal to 90º.
And the most common triangle is...
Love Triangle: Here a lover usually cheats on the other.

I unluckily have gotten stuck in all these 7 triangles.
Never deserved to be cheated but still got cheated.
I can not hate them but still, I so often get hated.
And the mathematical triangles only bothered.