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# Dilations in Math

## What Are Some Properties of a Circle?

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Examples include the widening of the pupil of the eye by the use of cycloplegic eyedrops for examination of the retina and opening of the uterine cervix to facilitate curettage by the use of a dilator.

Dilation of the pupils may indicate fear, shock, or cardiac arrest. See under anatomical location, e. References in periodicals archive? Balloon angioplasty was performed to relieve pulmonary stenotic sites, and the mean age at dilation was 5.

Major players operating in the global sinus dilation devices market and included in this report are Acclarent, Inc. Advancements in endoscopic techniques and drug therapy, especially biological products, have enabled endoscopic dilation to be applied for intestinal stenosis in patients with CD, followed by enhanced medical treatments and the postponement or even avoidance of surgery Endoscopic balloon dilation for stenotic lesions in Crohn's disease.

Let the truth be told. A dilation is a type of transformation that changes the size of the image. The scale factor, sometimes called the scalar factor, measures how much larger or smaller the image is. Below is a picture of each type of dilation one that gets larger and one that gest smaller. The picture below shows a dilation with a scale factor of 2.

This means that the image, A', is twice as large as the pre-image A. Like other transformations, prime notation is used to distinguish the image fromthe pre-image.

The image always has a prime after the letter such as A'. Dilations can also reduce the size of shape. Drag the center point O.

We start with a polygon ABC and a point O defining the center of dilation. We will draw the dilation of ABC with a scale factor of 2, meaning the image will be twice the size of the original:. Draw a ray from the center point O through one of the vertices.

Any one will do. Here we choose C:. Measure the distance from O to C. Let's say this is 3 centimeters. Multiply this by the scale factor 2 to get 6cm.

Measure out from O a distance of 6cm and mark a new point:. Repeat the above two steps for the other vertices, creating a total of three points:. Join the three new points with line segments, forming the dilation of the original triangle.

By convention, the new figure is labelled A'B'C'. While you are here.. Dilation - of a polygon A transformation in which a polygon is enlarged or reduced by a given factor around a given center point. The transformed figure is called the dilated image of the the original. Scale factor The amount by which the image grows or shrinks is called the "Scale Factor". Center of dilation In the figure above we have made it easy by placing the center of dilation O in the center of the rectangle, but it can be anywhere.

## Main Topics

The definition of Dilation: To resize something. In general English it means to make larger. But in.

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Dilations may be with respect to a point (dilation of a geometric figure) or with respect to the axis of a graph (dilation of a graph). Note: Some high school textbooks erroneously use the word dilation to refer to all transformations in which the figure changes size, whether the figure becomes larger or smaller.