What is a hamisphere?

It seems you're asking about "hemisphere." A hemisphere is half of a sphere.

Here's a breakdown:

* Sphere: A perfectly round three-dimensional object, like a ball.

* Hemisphere: A sphere cut exactly in half. Imagine slicing a ball through its center. Each half is a hemisphere.

Examples:

* Earth's Hemispheres: The Earth is divided into the Northern Hemisphere and the Southern Hemisphere by the equator.

* Brain Hemispheres: The human brain is divided into two hemispheres, the left and right.

Let me know if you have any more questions!