Understanding Quadrilaterals

If a polygon has 12 sides, what is it usually called?

Which of these polygons has the same number of sides and diagonals?

A polygon with all sides equal but not all angles equal is called:

What is the name of a polygon with 10 sides?

How many sides does a regular polygon have if its interior angle is $135^\circ$?

Four angles of a pentagon are each $100^\circ$. What is the measure of the fifth angle?

A quadrilateral with at least one pair of parallel sides is technically a:

In a parallelogram $ABCD$, if $\angle A = 2x$ and $\angle C = 80^\circ$, find $x$.

If the perimeter of a kite is $40\text{ cm}$ and one side is $7\text{ cm}$, find the length of an adjacent unequal side.

Which quadrilateral features diagonals that always bisect the interior vertex angles?

In a rectangle, the diagonals bisect each other at point $O$. If $\angle AOB = 60^\circ$, then $\triangle AOB$ is:

If two opposite angles of a parallelogram are $(4x - 5)^\circ$ and $(65 - x)^\circ$, find $x$.