Question

Determine whether the conclusion is valid. If not, identify the additional information needed to make it valid.

Given: DE∥GF , EF∥DG


Conclusion: DEFG is a rhombus.

Answer 1

Not valid: DF is perpendicular to EG (2nd)

Explanation:

Not all parallelograms whose opposite sides are parallel is a rhombus. A rhombus's special characteristic is that their diagonals are perpendicular to each other.