a = 5cm
h = 5cm
d = 13cm
h^2 + b^2 = d^2
5^2+b^2=13^2
25 + b^2 = 169
b = [tex]\sqrt{144} = 12[/tex]
b-a = 12-5=7
7^2+5^2=c^2
49+25=c^2
c=[tex]\sqrt{74}[/tex]
[tex]P = \frac{(a+b)*h}{2} \\P = \frac{(5+12)*5}{2} = \frac{17*5}{2} = \frac{85}{2} = 42.5cm^2\\Ob = a+b+h+c = 5+12+5+\sqrt{74} = 22 + \sqrt{74}[/tex]
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