A seat designed for a four-sided shape is commonly referred to as a "quadrilateral seat." Quadrilaterals are shapes with four sides, such as squares or rectangles, and the term can apply to furniture or seating arrangements that incorporate these geometric forms.
you call a seven sided shape a heptagon.
pushed out of shape
you call a two dimensional shape with six sides a hexagon
you call it a edge
this shape is called a Pentacontagon
A quadrilateral
trapeze The word is from Greek, trapezium, a foursided shape with only one pair of sides parallel.
Outside Inside Foursided
Throne
you call a seven sided shape a heptagon.
Call the company that makes the car seat.
it is the side airbags
When looking for a BMX bike with a comfortable seat, consider features such as padding, size, and shape of the seat. Look for a seat with sufficient cushioning and support, as well as a shape that fits your body comfortably. Adjustable seat height can also help customize the fit for added comfort.
usher
saddle
saddle
If you call out shotgun it means you get the front passanger seat in the vehicle.