Bonjour,
1)
[tex]A_{cercle} = \pi \times r^2 = \pi \times 3^2 = 9\pi \ m^2[/tex]
[tex]A_{triangle} = \frac{b\times h}{2} = \frac{3\times 3}{2} = \frac{9}{2}[/tex]
[tex]A_{finale} = \frac{3}{4}A_{cercle} + A_{triangle} = \frac{3}{4}\times 9\pi + \frac{9}{2} \\\boxed{A_{finale} = \frac{27\pi + 18}{4}\ m^2}[/tex]
2)
[tex]\boxed{A_{finale} \simeq 25,71 \ m^2}[/tex]
