an octagon it has eight sides
trapezoid
There is no specific name for such a shape.
It it called a trapeziumor a Square
Trapezium
A shape that has 4 right angles and 2 pairs of parallel lines is a rectangle. In a rectangle, all four angles are right angles, meaning they measure 90 degrees each. Additionally, opposite sides of a rectangle are parallel, resulting in two pairs of parallel lines within the shape.
trapezoid
Trapezium (Uk English)
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
A trapezoid perhaps?
A right trapezium.
The four sided shape that has two parallel lines is called a trapezoid. A parallelogram is a four sided shape that has two pairs of parallel lines.
quadrilateral
A shape with four sides and one set of parallel lines is called a trapezoid (or trapezium in some regions). In this shape, one pair of opposite sides is parallel, while the other pair is not. The trapezoid can have varying angles and side lengths, but this defining characteristic sets it apart from other quadrilaterals.
A regular octagon.
paralellogram
A shape that has 2 parallel lines and 4 perpendicular lines is a rectangle. In a rectangle, the opposite sides are parallel, while the adjacent sides are perpendicular to each other. Therefore, a rectangle fits the description of having two sets of parallel lines and four right angles formed by the perpendicular lines.
parallelogram