Each interior angle of a regular polygon is double of its exterior angle. Find the number of sides in the polygon.

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the given statement along with the definition or property used.

$\mathrm{AD}=.........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the given statement along with the definition or property used.

$\mathrm{DC}=.........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the given statement along with the definition or property used.

$\angle \mathrm{DCB}=.........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the given statement along with the definition or property used.

$\angle \mathrm{ADC}=.........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the given statement along with the definition or property used.

$\angle \mathrm{DAB}=\dots \dots \dots .$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the statement along with the definition or property used.

$\mathrm{OC}=........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete the statement along with the definition or property used.

$\mathrm{OB}=........$

In the given figure, $\mathrm{ABCD}$ is a parallelogram. Complete each statement along with the definition or property used.

$\mathrm{m}\angle \mathrm{DAB}+\mathrm{m}\angle \mathrm{CDA}=...........$