Question

calcule a área de um circulo cujo raio mede 5cm

Answer 1

A = π . r² 
A = π . 5,5² 
A = 30,25 π cm² 

Resposta: A área do círculo é 30,25 π cm² 

Answer 2

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

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

$\Large\displaystyle\text{ \begin{gathered} \sf{A=3{,}14\cdot25 } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\sf{A=78{,}5\,cm^2 } }\end{gathered} }$