Unspillable Cup

State two advantages of using disposable paper cups over disposable plastic cups.

Statements:- All cups are saucers. No saucer is a kettle. Conclusion:- I. No cup is a kettle. II. No kettle is a cup.

Statement : I. Some cups are glasses. II. No plate is cup as well as glass. Conclusion: I. Some cups are plates. II. All glasses are not plates.

Statements:- Some tins are round. Some cups are round. Conclusions:- I .Some tins are cups. II. Some round are tins.

A semi-circular sheet of metal of diameter 28 cm is bent into an open conical cup. The depth of the cup is approximately