That's what I call a "square".
triangle
what is the equation to figure the angles of a polygon?
which pairs of angles in the figure below are vertical angles
Exterior angles
These are angles on the inside of a figure.
Add all measurements of the sides on the figure
It depends on what the angles are. If any of the angles have measurements greater than 180 degrees, it is concave. If all angles are less than 180 degrees, then it is concave. For example, a regular hexagon has six 120 degree angles, so it is convex. If there was a hexagon with five 90 degree angles and one 270 degree angle, it would be concave.
The angles have the same measure. In the reflection the order of the angles are changed from clockwise to counterclockwise.
A circle.
If all of the angles add to 180 degrees the figure is a triangle. * * * * * That is if they form a plane figure. Angles that add to 1890 degrees are called supplementary angles.
No, a rectangle is not a figure with no angles. A rectangle is a quadrilateral with four right angles. Each angle in a rectangle measures 90 degrees. If a figure has no angles, it would be a circle, which has no straight lines or angles.
The number of all possible angles is infinite and no figure can show them all.