Răspuns :
80 cm = 8dm
Lungimea = 8dm
latimea = a
A = L x l => 40 = 8 x a
a = 40 : 8
a =5 ( latimea )
P = ( 5+8) x 2 = 13 x 2 = 26 dm
Lungimea = 8dm
latimea = a
A = L x l => 40 = 8 x a
a = 40 : 8
a =5 ( latimea )
P = ( 5+8) x 2 = 13 x 2 = 26 dm