Question

HELP ASAP!!!! Please tell me the steps and answer on how to do it.

Answer 1

71.4

Explanation:

For this, we will use Heron's Formula, or

`√(p(p-a)(p-b)(p-c))`,

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

`√(p(p-a)(p-b)(p-c))` =
`√(5103.8679) =71.4` rounded to the nearest tenth