Aria dreptunghiului = L × l
L = lungimea
l = latimea
l = 8,25 cm
Ad = 75 cm²
75 = 8,25 × L
75 = [tex]\dfrac{825}{100}\cdot L[/tex]
825L= 7500
[tex]L = \dfrac{7500}{825}[/tex]
[tex]L = \dfrac{\not7500}{\not825}[/tex]
[tex]\boxed{L = \dfrac{100}{11}\:cm}[/tex]
Perimetrul dreptunghiului = 2 × (L +l)
[tex]Pd =2\cdot\Big(\dfrac{100}{11}+\dfrac{825}{100}\Big)[/tex]
[tex]Pd=2\cdot\Big(\dfrac{100}{11}+\dfrac{33}{4}\Big)[/tex]
[tex]Pd = 2\cdot\dfrac{763}{44}[/tex]
[tex]Pd = \not 2 \cdot\dfrac{763}{\not44}[/tex]
[tex]\boxed{\bf Pd = \dfrac{763}{22}\:cm}[/tex] sau Pd = 34,68(18) cm
