Trigonometry

More examples ...


Here's a right angled triangle:





And another example ...




What is the area of the triangle?

Well, the formula we've been given for area says:

where a & b are the lengths of the sides of the triangle either side of the angle C.


So, in our example ...
                        a = 6.5
                        b = 12
                        C = 110o


So, the area of the triangle is ...

So, putting these numbers into a calculator gives ...

                        Area = 36.648cm2