PBS
Human Tree: Ratios
Create a personal tree. By visiting an exhibit at the National Museum of Mathematics, the resource introduces the idea of fractals. The exhibit takes an image of the person and creates a tree by repeating scaled images on the shoulders...
Corbett Maths
Enlargements with Negative Scale Factor
How will a scale factor affect a figure—negatively? Using a grid, the narrator of an engaging video performs a dilation with a negative scale factor. The presenter compares a positive scale factor with a negative scale factor to explain...
Corbett Maths
Enlargements Using Ray Method
Figure out what to do when there is no grid to count. Using a ruler and a sharp pencil, the narrator shows how to perform a dilation when the figure is not on a grid. The ray method works by drawing a ray from the center of dilation...
Corbett Maths
Enlargements with Fractional Scale Factors
Enlargements make it bigger, right? A video shows viewers how to perform a basic dilation with a fractional scale factor. They learn how to use the scale factor to find the location of the transformed vertex by multiplying the horizontal...
Corbett Maths
Finding the Centre of Enlargement
Where did the transformation begin? Using a ruler, the narrator of a short presentation shows how to find the center of enlargement for transformed figures. Worksheets provide the class members an opportunity to practice the newly...
Corbett Maths
Describing Enlargements
What caused that to happen? Using three aspects, a video demonstrates how to describe an enlargement or dilation. The presenter counts the lengths of the sides to determine the scale factor and a ruler to find the center of dilation.
Corbett Maths
Enlargements
Count on the scale to enlarge a figure. The video shows how to create an enlargement given a scale factor and a center of enlargement. The presenter multiplies the vertical and horizontal distance by the scale factor to find the new...
CK-12 Foundation
Dilation: Lesson
Dilation—more than just an eye opener! A short video introduces the concept of dilating a figure given a center and a scale factor. Using prime notation, the installment of a larger geometry playlist shows how to label dilated images.
CK-12 Foundation
Dilation in the Coordinate Plane: Lesson
Multiply coordinates to either shrink or enlarge a figure. An informative segment of a geometry playlist introduces dilation on the coordinate plane. The dilations in the resource use the origin as the center of dilation, which makes...
Mathed Up!
Mixed Transformations
Viewers learn how to identify and perform a variety of transformations with a video that provides seven items on transformations. Pupils demonstrate their understanding of dilations, reflections, rotations, and translations. The video...
Brightstorm
Transformations and Isometries
Give your class a solid foundational understanding of transformations. The instructor in a concept video describes each type of transformation and transformation notation. He also identifies the types of transformations that...
Brightstorm
Dilations of Quadratic Graphs - Concept
Help learners recognize the characteristics of a quadratic graph and how changes affect them. An informative video uses a graphing calculator in order to find out what happens when the leading coefficient of a quadratic...
Curated OER
What is a Transformation?
A transformation is the process of changing the graph of a figure or a shape. The instructor introduces the four most common transformations: reflection, dilation, rotation, and translation. So watch as she draws the transformations on a...
Curated OER
How Do You Make a Figure Larger Using a Dilation?
A dilation increases or decreases the size of a figure. In this lesson the teacher shows you how to use a scale factor of three to dilate the given figure. She identifies the ordered pairs, multiplies them by three, plots the new...
Curated OER
What is a Transformation?
A transformation is the process of changing the graph of a figure or a shape. The instructor introduces the four most common transformations: reflection, dilation, rotation, and translation. So watch as she draws the transformations on a...
Curated OER
How Do You Make a Figure Larger Using a Dilation?
A dilation increases or decreases the size of a figure. In this lesson the teacher shows you how to use a scale factor of three to dilate the given figure. She identifies the ordered pairs, multiplies them by three, plots the new...
Math Mammoth
Math Mammoth: Integers Lesson: Solved Examples, Part 2
Models how to solve integer problems on absolute value and on the dilation of a triangle. [4:25]
Khan Academy
Khan Academy: Dilating Shapes: Shrinking Down a Triangle by Half
Demonstrates how to plot a triangle on a Cartesian grid after a dilation and with a scale factor of 1/2. [2:26]
Virtual Nerd
Virtual Nerd: What Is a Transformation?
Transformations allow you to change or move a figure. Learn about all the different kinds of transformations by watching this tutorial. [4:18]
Virtual Nerd
Virtual Nerd: What Is a Dilation?
When someone's eyes dilate, their pupils get bigger or smaller, but they always stay the same shape. Dilation in math is very similar. When you dilate a figure, you change the size of the figure without changing its shape. This tutorial...
Virtual Nerd
Virtual Nerd: What Is a Transformation?
Transformations allow you to change or move a figure. Learn about all the different kinds of transformations by watching this video. [4:19]
Virtual Nerd
Virtual Nerd: How Do You Make a Figure Larger Using a Dilation?
Dilation allows you to shrink or enlarge the size of a figure without changing its shape. In this tutorial, you will learn how it's done. [3:50]
Virtual Nerd
Virtual Nerd: What Is a Dilation?
When you dilate a figure, you change the size of the figure without changing its shape. This tutorial introduces you to dilation. [8:38]
Imagine Learning Classroom
Learn Zillion: Prove Two Figures Are Similar After a Dilation
In this lesson, you will learn how to determine if two figures are similar by using dilations and scale factors. [5:23]