Question

Problema lungimea dreptunghiului de 75 mm perimeteu 18 cm care esta latimea si aria

Answer 1

P=2L+2l       75mm=7,5cm

7,5cm=2*L+2*l

7,5cm=2*18cm+2*l

7,5cm=36cm+2l

2l+36cm=7,5/-36

2l=28,5/:2

l=14,25cm

Aria= L*l=18 cm *14,25cm=256,5cm²