Respostas

2014-05-05T15:42:28-03:00
Calculemos as áreas dos trapézios

Trapézio 1

B → 13 cm
b → 7 cm
h → 7 cm
\boxed{S= \frac{(B+b)h}{2} ~\to~S= \frac{20.7}{2} ~\to~S=70~cm^2}

Trapézio 2

B → 39 cm
b → 21 cm
h → 21 cm

\boxed{S= \frac{(B+b)h}{2} ~\to~S= \frac{60.21}{2} ~~\to~S=630~cm^2}

Calculando a razão entre as áreas

\boxed{r= \frac{Trapezio~1}{Trapezio~2} ~\to~r= \frac{70}{630} ~\to~ r= \frac{1}{9} }

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