Tumbler is pupa of

Rewrite the following statement in the form p if only if q : If a tumbler is half empty, then it is half full and if a tumbler is half full, then it is half empty.

Fill up the gap. The shape of a glass (tumbler) is usually in the form of ............ of a cone.

Two pairs of statements p and q are given below . Combine theses two statements using the biconditional phrase "if and only if " . p : If a tumbler is half empty , then it is half full . q : If a tumbler is half full , then it is half empty.