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$ABCD$-romb; $\angle BAD = 50^\circ$; $\angle ABC = x = ?$ $ABCD$-romb; $\angle ABC = 100^\circ$; $\angle BAD = x = ?$ $ABCD$-romb; $\angle ABC = x + 80^\circ$; $\angle BAD = x + 20^\circ$; $x = ?$ $ABCD$-romb; $\angle ABC = 4x + 20^\circ$; $\angle BAD = x - 20^\circ$; $x = ?$ $ABCD$-romb; $\angle BAD = 50^\circ$; $\angle BCD = x$; $x = ?$ $ABCD$-romb; $\angle BCD = 60^\circ$; $\angle BAD = x$;