Question

Aria dreptunghiului ABCD este egala cu 28 cm. Daca AB= 7 cm, aflati perimetrul dreptunghiului ABCD.​

Answer 1

$\bf\red{\boxed{A_{dreptunghi}=L\times l}}$

$A_{ABCD}=AB\times BC\\28=7\times BC\\7BC=28\\BC=28:7=4$

$P_{ABCD}=AB+BC+CD+DA\\sau\\P_{ABCD}=2L+2l=2\times7+2\times4=14+8=\bf\purple{22\:cm}$