What is the sum of all the interior angles of a polygon having ‘n’ sides?

What is the sum of all the exterior angles of a polygon?

What is the measure of an exterior angle of a regular octagon?

What is the measure of an interior angle of a regular hexagon?

If the exterior angle of a regular polygon is 72°, then what is the number of sides of the polygon?

If the interior angle of a regular polygon is 144°, then what is the number of its sides?

In the figure, PQRS is a parallelogram. Find the values of x, y and z.

In a parallelogram JKLM, if , find all other angles.

Take two identical set squares with angles 30°-60°-90° and place them adjacently to form a parallelogram as shown in Figure. Does this help you to verify the above property?

Take two identical 30°-60°-90° set-squares and form a parallelogram as before. Does the figure obtained help you to confirm the above property?