\[Схематический\ рисунок.\]
\[P = 32\ см;r = 1,5\ см:\]
\[p = \frac{1}{2}P = \frac{1}{2} \bullet 32 = 16\ см;\]
\[S_{\text{ABC}} = pr = 16 \bullet 1,5 = 24\ см^{2}.\]
\[Ответ:\ \ 24\ см^{2}.\]