Question

Parallelogram ABCD ​ is a rectangle.

Answer 1

Answer:

$AC=BD$

$AB\perp BC$

Step-by-step explanation:

A parallelogram is a quadrilateral (4-sided polygon)  that has two pairs of parallel sides.  

In this sense, this figure shows a especial parallelogram called rectangle, since its four sides form right angles ($90\°$).

Hence:

$AB\parallel DC$

$AD\parallel BC$

$AB=DC$

$AD=BC$

$AB\perp BC$

$AD\perp DC$

So, the correct choices among the given options are:

$AC=BD$

$AB\perp BC$

Answer 2

Answer:

AC=BD

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Step-by-step explanation:

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