Respostas

2013-10-03T15:53:11-03:00
Cálculo da outra diagonal:

5² = 4² + ( \frac{x}{2}

25 = 16 + ( \frac{x^2}{4} )

100 = 64 + x²

x² = 100 - 64

x² = 36

x = 6 cm

A = D*d / 2

A = 8*6 / 2

A = 24 cm².
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