Question

Calculati aria discului cu raza de 2,(3)



Calculati aria discului cu diametrul de 4,(4)
VA ROG AJUTATIMA

Answer 1

A= πr²=π*($2 \frac{3}{9}$)²=π*($\frac{7}{3}$)²=$\frac{49}{9}$π

d=4,(4)= $\frac{40}{9}$ => r= $\frac{d}{2}$ = $\frac{40}{9} * \frac{1}{2} = \frac{20}{9}$
A=πr²= π ($\frac{20}{9}$)²= $\frac{400}{81}$ π