Given that the area of the triangle is 10 and two of the sides are
�
=
3.2
a=3.2 and
�
=
6.6
b=6.6, and the included angle is
�
C, we can use the given formula:

Area
=
1
2
�
�
sin
⁡
(
�
)
Area=
2
1
​
absin(C)