The area of a triangle is given by the formula below
$\mathrm{Area}=\frac{\mathrm{Base}\times \mathrm{Height}}{2}$
Therefore Triangle Formula can be written as
$a=\frac{b\times h}{2}$
Where
b is Base of Triangle
h is Height of Triangle
When length of two sides and angle between the two sides is given formula for area of triangle can be written as
$\mathrm{Area}=\frac{a\times b\times \mathrm{Sin\; C}}{2}$
Where
a and b is length of sides
C is angle between two sides a and b