# Geometry

### From Wikipedia, a free encyclopedia written in simple English for easy reading.

**Geometry** is a kind of mathematics used to work with shapes.

## Contents |

### [edit] Examples of Shapes in Geometry

There are flat shapes and solid shapes in geometry. Squares, circles and triangles are some of the simplest shapes in flat geometry. Cubes, cylinders, cones and spheres are simple shapes in solid geometry.

### [edit] Measuring in Geometry

Geometry can be used to measure a flat shape's area and perimeter.

It can also be used to measure a solid shape's volume and surface area.

### [edit] How is Geometry Used?

Many things have the shapes found in geometry. Geometry can be used to measure many things by seeing them as made of geometrical shapes. For example, geometry can help people find:

- the surface area of a house, so they can buy the right amount of paint
- the volume of a box, to see if it is big enough to hold a litre of food
- the area of a farm, so it can be divided into equal parts
- the distance around the edge of a pond, to know how much fencing to buy.

### [edit] Where Did Geometry Come From?

Geometry began as the art of measuring the shape of land so that it could be shared fairly between people. It means to measure the land. It has grown from this to become one of the most important parts of mathematics. It was created by the Greek mathematician Euclid.

## [edit] Some Simple Ideas in Geometry

In mathematics, geometry starts with a few simple ideas:

A **point** is shown on paper by touching it with a pencil or pen, without making any sideways movement. We know where the point is, but it has no size.

A **straight line** is the shortest distance between two points. For example, John pulls a piece of string tight from one point to another point. A straight line between the two points will follow the path of the tight string.

A **plane** is flat surface that does not stop in any direction. A ball placed any place on this flat surface will not move if gravity on the surface is constant.