# Question: How Do You Prove Dilation?

## How do you do dilation lines?

One point on the line that you are dilating, another point on the target for that point.

Find the scale factor by dividing the distance to the target by the distance to the point on the line that you are dilating..

## Why is a dilation a similar figure?

In order for two figures to be similar, they must have congruent (equal) corresponding angle measures and proportional sides. Dilations create similar figures because multiplying by the scale factor creates proportional sides while leaving the angle measure and the shape the same.

## What is center of dilation?

The center of a dilation is a fixed point in the plane about which all points are expanded or contracted. The center is the only invariant (not changing) point under a dilation (k ≠1), and may be located inside, outside, or on a figure.

## Is trapezoid ABCD the result of a dilation?

Is trapezoid ABDC the result of a dilation of trapezoid MNPQ by a scale factor of ? Why or why not? No, because AB is the length MN but CD is the length QP.

## What is a real life example of dilation?

Larger or smaller version of a figure that preserves its shape. If you’ve watched a crime show on television, you’ve seen how dilation supposedly works in the real world. Investigators use computers to dilate photographs, and the larger pictures yield information about license plates, addresses, or criminals.

## What is the coordinate rule for dilation?

First consider dilations with the origin as center. Then the coordinate rule for a dilation with scale factor k is simply this: (x, y) –> (kx, ky).

## How do you know if a dilation is an enlargement or reduction?

A dilation is a transformation that produces an image that is the same shape as the original, but is a different size. A dilation that creates a larger image is called an enlargement. A dilation that creates a smaller image is called a reduction. … If the scale factor is 1, the figure and the image are congruent.

## How do you determine dilation?

To find the scale factor for a dilation, we find the center point of dilation and measure the distance from this center point to a point on the preimage and also the distance from the center point to a point on the image. The ratio of these distances gives us the scale factor, as Math Bits Notebook accurately states.

## Does a dilation change orientation?

Dilations. A dilation is a transformation which preserves the shape and orientation of the figure, but changes its size. The scale factor of a dilation is the factor by which each linear measure of the figure (for example, a side length) is multiplied.

## How do you dilate a scale factor of 3?

Perform a Dilation of 3 on point A (2, 1) which you can see in the graph below. Multiply the coordinates of the original point (2, 1), called the image, by 3. Image’s coordinates = (2 * 3, 1 * 3) to get the coordinates of the image (6, 3).

## What is true about the dilation?

Dilation is defined as a transformation of an image in which the size on this image changes but its shape does not change. 2. In dilation, to obtain the new dimensions of the image you must multiply the dimensions of the original image by a number called “Scale factor”.

## What is dilation in math?

Dilation Geometry Definition: A dilation is a proportional stretch or shrink of an image on the coordinate plane based on a scale factor. Stretch = Image Grows Larger.

## Is quadrilateral JKLM the result of a dilation?

Is quadrilateral JKLM the result of dilation if quadrilateral ABCD by a scale factor of 2? Why or why not? No, because sides JM and KL have different slopes from sides AD and BC.

## Does dilated mean big or small?

Muscles in the colored part of your eye, called the iris, control your pupil size. Your pupils get bigger or smaller, depending on the amount of light around you. In low light, your pupils open up, or dilate, to let in more light. When it’s bright, they get smaller, or constrict, to let in less light.

## What stays the same in a dilation?

In dilation, the image and the original are similar, in that they are the same shape but not necessarily the same size. They are not congruent because that requires them to be the same shape and the same size, which they are not (unless the scale factor happens to be 1.0).

## How do you know a dilation will produce similar figures?

Dilations produce similar figures because the image and pre-image will have congruent corresponding angles. The corresponding side lengths of the figures will be proportional based on the scale factor. The shape is preserved and the sides are enlarged or reduced by the scale factor.

## Do dilations take parallel lines to parallel lines?

(Theorem: If two lines are cut by a transversal and the corresponding angles are congruent, the lines are parallel.) A dilation takes a line NOT passing through the center of the dilation to a parallel line. It is important to keep in mind that dilations also create parallel “segments” when dealing with figures.

## How do you solve a dilation in geometry?

Starting with ΔABC, draw the dilation image of the triangle with a center at the origin and a scale factor of two. Notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). Dilations involve multiplication! Dilation with scale factor 2, multiply by 2.