Question

DAU CU COROANĂ! va rog mult *cu desen daca e nevoie*❤️❤️❤️​

Answer 1

Răspuns:

nu este nevoie de desen

a. A=L²

L=4 cm=>A=4×4=16cm²

L=3,5dm=>A=3,5×3,5=12,25 dm²

L=1,(3)cm=>A=4/3×4/3=16/9 cm²

1,(3)=(13-1)/9=12/9=4/3

b. P=4L

26=4L=>L=26/4=>L=6,5 cm

A=6,5×6,5=42,25 cm²

P=13,2=>L=13,2/4=>L=3,3 cm

A=3,3×3,3=10,89cm²

c. A=400cm²=>L=√400=>L=20cm

Answer 2

$\it a)\ \ \mathcal{A}=\ell^2=14^2=196\ cm^2\\ \\ b)\ \mathcal{A}=\ell^2=\Big(\dfrac{\mathcal{P}}{4}\Big)^2=\Big(\dfrac{13,2}{4}\Big)^2=3,3^2=10,89\ cm^2\\ \\ c)\ \ \mathcal{A}=\ell^2 \Rightarrow 400=\ell^2 \Rightarrow 20^2=\ell^2 \Rightarrow \ell=20\ cm$