Răspuns :
[tex]arie \: sector \: = \frac{45 \times \pi \times {r}^{2} }{360} = \frac{45 \times \pi \times {6}^{2} }{360} = \frac{45 \times \pi \times 36 }{360} = \frac{45 \times \pi }{10} = 4.5\pi[/tex]
[tex]\it \mathcal{A}_{sector}=\dfrac{\pi R^2\cdot u}{360^o}=\dfrac{\pi\cdot36\cdot 45^o}{360^o}= 4,5\pi[/tex]