Question

Calculeaza aria discului cu diametrul de 1 intreg si 2 pe 5 cm

Answer 1

  
[tex]\displaystyle \\ D =1 \frac{2}{5} = \frac{7}{5} ~cm = Diametru\\ \\ A_{_\bigcirc} = \frac{\pi D^2}{4} = \frac{ \Big(\frac{7}{5}\Big)^2 \times \pi}{4} = \frac{ \frac{49}{25} \times \pi}{4} = \frac{49 \pi}{25\times 4} = \boxed{\frac{49 \pi}{100} cm^2} [/tex]