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Antwort
a)
A=0,8*0,6=0,48m²
U=(4*0,4)+(2*0,6)+(4*0,2)=3,6m

b)
A=pi*r²= 0,126m²
U=2*pi*r=1,257m

c)
A=(0,3*0,9)+(0,3*0,9)-pi*0,15²
   = 0,469m²
U=(8*0,3)+(8*0,3)+pi*2*r
   = 5,74m