Question

calcule a área de um círculo cujo raio mede 3,5cm

Answer 1

Área do circulo ⇒ π × r²

π = 3,14

A = π × r²
A = 3,14 × (3,5)²
A = 3,14 × 12,25
A = 38,46 cm²

Espero ter ajudado! ^^

Answer 2

$\Large\displaystyle\begin{gathered} \sf{ A=\pi\cdot r^2} \end{gathered}$

$\Large\displaystyle\text{ \begin{gathered} \sf{ A=3{,}14\cdot3{,}5^2} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{A=3{,}14\cdot12{,}25 } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\sf{A=38{,}465\,cm^2 }} \end{gathered} }$