ANGLES
The three internal angles of a triangle always add up to 180 degrees.  Sometimes different
angles can be the same size within the same
triangle, when this occurs the triangles have
special names. 

When all three angles are the same size the
triangle is called an EQUILATERAL 
triangle, when two angles are of the same size, the triangle is called an ISOSCELES
triangle, and when the triangle has no equal
angles, it is said to be a SCALENE triangle.

AREA
The area of a triangle is mathematically worked out the
same way for every different triangle you may come
across.

It is worked out by using the mathematical formula:-

AREA = ½ x base of triangle x vertical height of triangle