Use the conditional: If $\Delta ABC$is acute, then $m\angle C\ne 90$.

Given: All rhombuses are parallelogram. What can you conclude from each additional statement? If no conclusion is possible, write no conclusion.

1. ABCD is not a parallelogram.
2. QRST is not a rhombus.
3. MNOP is a parallelogram.
4. GHIJ is a rhombus.

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