Area of a triangle

This can be calculated using the formula:

To do this, you first need to know the lengths of two sides and the angle in between them.

To find the area of the triangle below:

area of a triangle=\frac { 1 }{ 2 } bc\quad sinA

area = \frac { 1 }{ 2 } \times 7.1\times 5.2\quad sin 42

= { 12.4 }^{ 2 }