## Using a Column Vector to Describe a Translation

A column vector is used to describe a translation. A column vector breaks down the translation into:- How far a shape moves in the
**horizontal**direction (left or right). - How far a shape moves in the
**vertical**direction (up or down).

- The top number (4) describes how the shape has moved in the
**horizontal**direction. A positive number describes a move to the right. A negative number describes a move to the left. - The bottom number (2) describes how the shape has moved in the
**vertical**direction. A positive number describes a move up. A negative number describes a move down.

## How to Describe a Translation

## Question

Describe the translation of the shape shown below. The light blue shape is the original shape (called the object). The dark blue shape is the shape after it has been translated (called the image).## Step-by-Step:

Let us start by choosing a point on the object and see where it has been translated. We will choose point**A**on the object. We see it has been translated to point

**A'**.

## 1

Find how many units the point has moved in the

**horizontal**direction. In our example, point**A**has moved**2**units to the**right**.## 2

Write this as the

**top**number in a column vector.- The point has moved
**2**units, so the number will be**2**. - The point has moved
**right**, so the number will be**positive**.

## 3

Find how many units the point has moved in the

**vertical**direction. In our example, point**A**has moved**2**units**down**.## 4

Write this as the

**bottom**number in a column vector.- The point has moved
**2**units, so the number will be**2**. - The point has moved
**down**, so the number will be**negative**.

## Answer:

The translation can be described by the column vector below:## What Is a Translation?

A translation is a slide of a shape: without rotating, reflecting or resizing it. A translation is a type of transformation.## Horizontal Translations

A horizontal translation only moves a shape left or right (but not at all up or down). Because of this, the bottom number in a column vector will be**0**.

## Vertical Translations

A vertical translation only moves a shape up or down (but not at all left or right). Because of this, the top number in a column vector will be**0**.

## Top Tip

## Stick to the Point!

When a shape is translated, each point in the shape moves the same direction and distance. When describing a translation, see how a single point has been moved. Choose a point on the shape, and see how it has moved after it has been translated.## You might also like...

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