Answer:
71.4
Step-by-step explanation:
For this, we will use Heron's Formula, or
,
with p as the perimeter divided by 2, and a, b, and c are the side lengths.
Plugging our values in, (11.6+20+13)/2 = 22.3 = p, and
= rounded to the nearest tenth
look at the picture i have sent
move constant to the right and change the sign
X=12-8
X=4
just add all that up
Im sorry but I am not really sure myself ! I hope you find or found your answer already !
