Вот решение и ответ ........
P(треуг) <span>P = a + b + <span>c
p(квадр) </span></span><span>P = 4<span>a
р(прямоуг) </span></span><span>P = 2(a + b)
р(трапец) </span><span>P = </span>a<span> + </span>b<span> + </span>c<span> + </span><span>d
р(окруж) </span><span><span>P = 2 πr
</span><span>P = <span>π d</span></span></span>