# Question: What Happens When A Line Is Dilated?

## How do you prove dilation?

Lesson Summary Dilations can be used to prove figures are similar by finding the scale factor between the two images and ensuring the sides are proportional.

To find the scale factor, use the lengths of corresponding sides, set up a ratio and divide..

## How do you find the horizontal dilation?

Horizontal dilation. For example, replacing x by x/0.5=x/(1/2)=2x has the effect of contracting toward the y-axis by a factor of 2. If A is negative, we dilate by a factor of |A| and then flip about the y-axis. Thus, replacing x by −x has the effect of taking the mirror image of the graph with respect to the y-axis.

## What happens when you dilate an angle?

Explanation: Dilation (scaling) is the main basis for similarity in geometry. It transforms any line into the one parallel to it. Therefore, an image of an angle scaled to another location is another angle with correspondingly parallel sides.

## What is horizontal dilation?

“horizontal dilation” A horizontal stretching is the stretching of the graph away from the y-axis. A horizontal compression (or shrinking) is the squeezing of the graph toward the y-axis.

## How do I find the slope of the line?

The slope will be the same for a straight line no matter which two points you pick as you know. All you need to do is to calculate the difference in the y coordinates of the 2 points and divide that by the difference of the x coordinates of the points(rise over run). That will give you the slope.

## Is it true dilations always increase the length of line segments?

While they scale distances between points, dilations do not change angles. … All lengths of line segments in the plane are scaled by the same factor when we apply a dilation.

## What stays the same after a dilation?

After a dilation, the pre-image and image have the same shape but not the same size. Sides: In a dilation, the sides of the pre-image and the corresponding sides of the image are proportional. Properties preserved under a dilation from the pre-image to the image.

## Does angle measure change under a dilation?

While they scale distances between points, dilations do not change angles. … All lengths of line segments in the plane are scaled by the same factor when we apply a dilation.

## 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”.

## Does dilation preserve slope?

11. Dilating LINES y = mx + b (SLOPE ALWAYS PRESERVED… STAYS THE SAME!)

## 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).

## Is a horizontal stretch a dilation?

The image of a dilation is the same shape as the original figure, but is not necessarily the same size. Both the vertical length and horizontal length of a dilated figure are increased (or decreased) by the same factor. … If a figure is enlarged (or reduced) in only one direction, the change is referred to as a stretch.

## How do you dilate a line by scale factor?

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.

## How do you dilate a figure by 1 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 the difference between horizontal and vertical dilation?

The difference occurs because vertical dilations occur when we scale the output of a function, whereas horizontal dilations occur when we scale the input of a function.

## What means dilation?

Dilation: The process of enlargement, stretching, or expansion. The word “dilatation” means the same thing. Both come from the Latin “dilatare” meaning “to enlarge or expand.”