It could be a square or a rectangle. Or you could call it a quadragon.
On octagon is a plane (2-dimensional) figure which has only one face. There are no right angles on the face of an octagon.
For any n-sided plane figure the interior angles total 2n - 4 right angles.
a triangle can have only one right angle because the sum of all the three angles of a triangle has to be 180. so if there are more than one right angles, the sum of the angles will exceed 180 and hence the plane figure will no longer be a triangle
a closed plane figure with all sides congruent and all all angles
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.
They are possible - unlike plane triangles in which all of the angles are right angles, obtuse or larger.
This depends what the figure is referencing. A figure is only a square if it has four sides, all equal, connected by four angles, all right angles (90°).
One property of a rectangle is that all angles of the figure are right angles.
equilateral parallelogram
360 degrees
A plane figure bounded by five lines is called a pentagon. It is a polygon with five sides and five angles. The sum of the interior angles of a pentagon is 540 degrees. Pentagons can be regular, with all sides and angles equal, or irregular, with varying side lengths and angles.
The sum of the angles in all triangles (right, isosceles, scalene, and equilateral) in the Euclidean plane is 180 degrees or pi.