# Hemisphere Shape – Definition, Formula, Examples, Facts, FAQs

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## What Is a Hemisphere Shape in Geometry?

A hemisphere is formed when a plane cuts a sphere in half. When a sphere is divided into two equal halves, each half is then called a hemisphere.

A sphere is a 3D round shaped solid. Each point on its surface is equidistant from the center.

So, what does a hemisphere look like? Take a look at the image shown below!

It has a flat circular base and a curved surface. Note that the radius of the hemisphere is equal to the radius of the sphere it is cut from.

In everyday life, we come across a variety of hemisphere-shaped objects. For instance, if we cut a perfectly round lemon or an orange in identical halves, we get two hemispheres.

## Hemisphere: Definition

A hemisphere is a geometric shape that is exactly half of a sphere. The prefix “hemi” means “half.”

## Properties of a Hemisphere

• The radius of the hemisphere is equal to the radius of the sphere.
• A hemisphere has a flat circular base and a curved surface.
• A hemisphere has no edges and no vertices, just like a sphere.
• A hemisphere is not a polyhedron since it has a circular base and one curved surface.
• A line segment that meets the two opposite points on the base of a hemisphere and passes through its center is said to have that object’s diameter.

## Volume of a Hemisphere

A hemisphere’s volume is defined as the 3D space occupied by it, it is expressed in cubic units.

The volume of sphere is calculated using the formula $V = \frac{4}{3} \pi r^{3}$

We know the hemisphere is simply half of the sphere. The volume of the hemisphere is also half the volume of the sphere.

Hemisphere Volume $= \frac{2}{3} \pi r^{3}$

where

r is the hemisphere’s radius,

## Frequently Asked Questions on Hemisphere Shape

The curved surface area only includes the area of the curved region of the hemisphere. In contrast, the total surface area includes both the curved surface and the hemisphere’s base radius.

A hemisphere has a circular flat base and one curved surface. A sphere only has one curved surface, whereas this object has several.

When the radii of a sphere and a hemisphere coincide, their volume ratio is 2:1.