Nacherti pryomougolnik so storonami 5sm 8mm i 3sm 3mm.vichisli ego perimetr
Perimetr pryamouqolnika raven 2×(a+b) 5 sm 8 mm raven 58 mm 3 sm3 mm raven 33mm 2×(58+33)=2×91=182 otvet raven 18 sm 2 mm