Respostas

2013-11-23T00:54:01-02:00
A)
Base = b
Altura = a
Área = a.b

12,5 . b=80

b=80/12,5=6,4cm


b)
A=x.x/2=25

A=x^2=50

x=5 \sqrt{2}


l^2=(5 \sqrt{2} )^2+(5 \sqrt{2} )^2=50+50=100


l= \sqrt{100}=10m


Perimetro = 5 \sqrt{2}+5 \sqrt{2}+10=(10\sqrt{2}+10)m


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