I taught maths for 15 years and I can confidently say that there's no such thing as 'triangular maths'.
There are separate areas of mathematics which deal with the areas of triangles, the lengths of sides of right-angled triangles (Pythagoras' Theorem), the relationships between the lengths of sides and angles in a right-angled triangle (trigonometry), together with extensions of Pythagoras' Theorem and trigonometry to non-right-angled triangles, and a whole lot of Euclidean geometry associated with triangles but there's no such thing as 'triangular maths'!
If you need help with a particular problem, please post again with a bit more information ;-)
Chris