31(b). The are of triangle can be determined using Heron's formula, which requires the side length of triangle. Heron's formula is A= √s(s-a)(s-b)(s-c). In the formula A is the area ; a,b, an c are the side lengths; and s is half the perimeter of a+b+c/2. Determine the area of each triangle with the following side lengths. Express each area to the nearest tenth of a square centimetre.
First do a+b+c/2
Next is, do Heron's Formula