perimetro uguale a (2 x 4a) +(2× 2b)
area uguale a 4a x 2b
risposta 2
(4a x 1,25) x (2b x1,5) = 15ab
4a x 2 b = 8ab
15ab/8ab = 1,875 aumenta del 87,5 %
ciao
perimetro 2p = 2(4a+2b) = 8a+4b
area A = 8ab
perimetro 2p'= 2(4a*1,25+2b*1,5) = 10a+6b
area A' = 5a*3b = 15ab
ΔA = 100(15-8)/8 = 700/8 = 87,5 %