Half a sphere is a hemisphere
Hemispheres
a hemisphere
When a circle is folded along its diameter, it creates two congruent halves or semicircles.
The imaginary circle around the earth that divides it into two halves is called the Equator. It is located at 0 degrees latitude and serves as the starting point for measuring latitude.
The 2 halves in a circle are the 2 semi circles.
The diameter of a circle divides it into two halves
That line is called a "Diameter".
a line
They occur when you divide something on a line of symmetry.
Bilateral symmetry means you can divide the shape into two halves, and the halves would be congruent. Radial symmetry means all the parts that are connected to a common point are congruent.
A half of a quarter of a circle is 1/8 of a circle. There are four pieces making 1/4. If you split all of them into halves you have eighths.
It is called a great circle. The equator is an example.