An oval
A 3D semi circle
circumference
a sphere?
The half of a diameter of a circle is known as a radius.
A piece of an edge of a circle is called an ARC.
Rhombus
A parallelogram looks like a squashed over rectangle.
We call it a "semi-circle"
strait
Strait forward no.
edges
brim
A semi-circle
Concentric Circles?
We call it a circle.
A circle with three dimensions is sphere.
They call me the Fireman