pole figur podobnych

[snowinska91]

Figury A i B są podobne. Oblicz pole drugiej figury.

[kerajs]

a)
\(k= \frac{b}{a} = \frac{10}{15} = \frac{2}{3}\\
k^2= \frac{P_b}{P_a} \So (\frac{2}{3})^2= \frac{P_b}{9} \So P_b=...\)
b)
\(k= \frac{b}{a} = \frac{5}{2} \\
k^2= \frac{P_b}{P_a} \So (\frac{5}{2})^2= \frac{20}{P_b} \So P_b=...\)