A 3D semi circle
a sphere?
circumference
A piece of an edge of a circle is called an ARC.
The half of a diameter of a circle is known as a radius.
Rhombus
A parallelogram looks like a squashed over rectangle.
We call it a "semi-circle"
strait
The English call it the Strait of Dover because it is named after the town of Dover on the English side. The French call it Pas-de-Calais because it is named after the Calais region on the French side.
Strait forward no.
edges
brim
A semi-circle
Concentric Circles?
We call it a circle.
A circle with three dimensions is sphere.