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In each exercise, you could prove that quadrilateral SANGis a parallelogram if one more fact, in addition to those stated were given. State the fact.

∠ASG≅∠GNA

Short Answer

Expert verified

The additional fact that must be given so that SANGcan be a parallelogram is that the angles ∠SANand ∠SGN must be congruent.

Step by step solution

01

Step 1. Observe the given diagram.

The given diagram is:

02

Step 2. Description of step.

It is being given that ∠ASG≅∠GNA.

If the pairs of opposite angles of a quadrilateral are congruent then the quadrilateral is a parallelogram.

From the given diagram it can be observed that the pairs of opposite angles of the quadrilateral SANGare ∠ASG, ∠GNAand ∠SAN, ∠SGN.

Therefore, the quadrilateral SANGcan be a parallelogram if ∠ASG≅∠GNAand ∠SAN≅∠SGN.

As, ∠ASG≅∠GNA, therefore the angles ∠SANand ∠SGNmust be congruent so that SANGcan be a parallelogram.

03

Step 3. Description of step.

Therefore, the additional fact that must be given so that SANGcan be a parallelogram is that the angles∠SAN and ∠SGNmust be congruent.

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