What is the definition of a hemiphere?

A hemisphere is half of a sphere. A sphere is a perfectly round three-dimensional object, like a ball. So, a hemisphere is a half of a sphere cut through its center.

Here are some key points about hemispheres:

* Shape: They have a curved surface and a flat circular base.

* Dimensions: They are defined by their radius (the distance from the center to the edge of the sphere) and the circumference of their circular base.

* Examples: The Earth is often divided into the Northern Hemisphere and the Southern Hemisphere. A bowl is shaped like a hemisphere.

Let me know if you have any other questions!