It is a regular 5 sided pentagon whereas each interior angle is 108 degrees and the 5 angles add up to 540 degrees
It has less than three sides.
Pentagon.
A right angle triangle
I don't think there can be a shape with less than 3 sides.Or did you mean a name with two sides ??
Its not possible to have less than 4 four side that the most idiotic question i ever heard, No Sides, No Angles.
a rhombus
A triangle or a circle.
It has less than three sides.
pentagon
Pentagon.
Common shapes with less than 4 sides are triangles and circles ( but the circle has no straight sides).
triangle
triangular pyramid-4 equal faces
The pentagon satisfies those criteria precisely.
Less than Angels was created in 1955.
A right angle triangle
No polygon can have less than 3 angles. It would be a triangle with 3 sides but that has 3 angles.