$\text{P}=\frac{{60}^o}{{360}^{\cdot }}{18}^2{\text{cm}}^2\pi =\frac{1}{6}\cdot 324{\text{cm}}^2\pi =54\pi {\text{cm}}^2$

${\text{P}}_2=\frac{{60}^o}{{360}^o}{9}^2{\text{cm}}^2\pi =\frac{1}{6}\cdot 81\pi {\text{cm}}^2=13\frac{1}{2}\pi {\text{cm}}^2$ ${\text{P}}_2=\frac{{60}^o}{{360}^o}{9}^2{\text{cm}}^2\pi =\frac{1}{6}\cdot 81\pi {\text{cm}}^2=13\frac{1}{2}\pi {\text{cm}}^2$

$\frac{54\pi {\text{cm}}^2}{13\frac{1}{2}\pi {\text{cm}}^2}=4$

$\text{Kąt nalez˙y zwiększycˊ cztery razy.}$

 

$\text{Sprawdzenie:}$

${60}^o\cdot 4={240}^o$

$\frac{{240}^o}{{360}^o}\cdot 9^2\pi {\text{cm}}^2=\frac{2}{3}\cdot 81\pi {\text{cm}}^2=54\pi {\text{cm}}^2$