Question

Qual e a metade da area do circulo cujo diametro mede 45cm

Answer 1

$\Large\boxed{\begin{array}{l}\sf d=45cm\implies r=22,5\,cm\\\sf A=\pi\cdot r^2\\\sf A=\pi\cdot22,5^2\\\sf A=506,25\pi\,cm^2\\\sf \dfrac{A}{2}=\dfrac{506,25}{2}=253,125\pi\,cm^2\end{array}}$