1) r/2+r=3*r/2 (3/2)*r*r/((3/2)r+r)=3*r/5
2) r*3*r/(r+3*r)=3*r/4
r+(3/4)*r+r=11*r/4
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1) r/2+r=3*r/2 (3/2)*r*r/((3/2)r+r)=3*r/5
2) r*3*r/(r+3*r)=3*r/4
r+(3/4)*r+r=11*r/4
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