Question

Vă rog ajutați-mă dau coroană​

Answer 1

triunghi

$\huge A= \frac{b \times h}{2}$

Patrat

$\huge \: A = l \times l$

Cerc

$\huge A= \pi \times d \: sau \\ \huge \: A= \pi \times r {}^{2}$

Answer 2

$\it \mathcal{A}_{p\breve atrat}=\ell^2\\ \\ \mathcal{A}_{triunghi}=\dfrac{b\cdot h}{2}\\ \\ \\ \mathcal{A}_{disc}=\pi R^2=\pi\cdot\Big(\dfrac{d}{2}\Big)^2$