quadrangle
An octagon is an 8 sided shape.
27-agon
Improved Answer:- They mean 6 and 8 respectively
An affair on one side of something.
Any 4-sided shape like a square or rectangle.
a quadrangle
A quadrangle.
A quadrangle is a courtyard surrounded by a building or several buildings. So a courtyard is one possibility. Another example is a four sided polygon.
A quadrilateral is a four-sided, two-dimensional geometric figure. A Quadrangle is a rectangular-shaped open area surrounded by buildings. This is often found on a college campus.
3
a transverse multi-sided enclosurer (sealed or with a hole)
Something that is 8-sided is usually referred to as a octogon.
These were baptisteries that were used for baptisms.
Four sided figures are called quadrilaterals. They are usually squares, rectangles, trapizoids, etc..
Usually a 5 sided does have 5 sides. Although we don't have confirmation whether this is true in alternate universes. For example a 4 sided would have 4 sides.
delta
Paint it, lower the ceiling to cover it, build a 3 sided wooden beam or sheet rock enclosure around it. Use your imagination or that of a contractor.