Question

Aflati perimetrul unui dreptunghi cu aria de 75cm² si latimea egala cu 8,25 cm.​

Answer 1

Aria dreptunghiului = L × l

L = lungimea

l = latimea

l = 8,25 cm

Ad = 75 cm²  

75 = 8,25 × L

75 = $\dfrac{825}{100}\cdot L$

825L= 7500    

$L = \dfrac{7500}{825}$

$L = \dfrac{\not7500}{\not825}$

$\boxed{L = \dfrac{100}{11}\:cm}$

Perimetrul dreptunghiului = 2 × (L +l)

$Pd =2\cdot\Big(\dfrac{100}{11}+\dfrac{825}{100}\Big)$

$Pd=2\cdot\Big(\dfrac{100}{11}+\dfrac{33}{4}\Big)$

$Pd = 2\cdot\dfrac{763}{44}$

$Pd = \not 2 \cdot\dfrac{763}{\not44}$

$\boxed{\bf Pd = \dfrac{763}{22}\:cm}$ sau Pd = 34,68(18) cm