Question

calculați aria unui pătrat cu perimetrul egal cu: 12MM​

Answer 1

Perimetrul = 4 × latura

latura = 12 ÷ 4 = 3 mm

aria = latura²

3 × 3 = 9 mm^2

Answer 2

$\left\{\begin{aligned}&P_{\square{}}= 12\text{ mm}\\&P_{\square{}} =4l\end{aligned}\,\right| \Rightarrow 4l = 12 \text{ mm}\Rightarrow l = 3\text{ mm}$

$\left\{\begin{aligned}&A_{\square{}}= l^2\\&l = 3\text{ mm}\end{aligned}\,\right| \Rightarrow A_{\square{}} =(3\text{ mm})^2 \Rightarrow \boxed{A_{\square{}} =9\text{ }\mathrm{mm}^2}$