Warm Up - PowerPoint PPT Presentation

1 / 9
About This Presentation
Title:

Warm Up

Description:

Warm Up Tuesday, August 19th Dilations in the Coordinate Plane Tuesday, August, 19th Dilations What is a dilation? A transformation that changes the size of a figure. – PowerPoint PPT presentation

Number of Views:233
Avg rating:3.0/5.0
Slides: 10
Provided by: test5
Category:
Tags: math | warm

less

Transcript and Presenter's Notes

Title: Warm Up


1
Warm Up Tuesday, August 19th
2
Dilations in the Coordinate Plane
  • Tuesday, August, 19th

3
Dilations
  • What is a dilation?
  • A transformation that changes the size of a
    figure.
  • What are two types of dilations?
  • Enlargement
  • Reduction
  • The point of projection is called the center of
    dilation
  • The amount of change is written as a ratio and is
    called a scale factor.

4
Dilations
  • In the coordinate plane, the center of dilation
    is the origin.
  • To find the new coordinates, multiply the
    original coordinates by the scale factor.

5
Steps to Follow
  1. Plot the given points.
  2. Multiply each coordinate by the scale factor.
  3. Plot the image points.
  4. State the coordinates of the dilation.

6
Given the vertices of the triangle, find a
dilation by a scale factor of 3.
B
C
  • A (1,2)
  • B (3,3)
  • C (1,3)

A (3,6)
A
B (9,9)
C
B
C (3,9)
A
7
Given the vertices of the rectangle, find a
dilation by a scale factor of 2/3.
  • A (-6,-3)
  • B (-6,3)
  • C (6,3)
  • D (6,-3)

A (-4,-2)
B (-4,2)
C (4,2)
B
C
D (4,-2)
B
C
A
D
A
D
8
Practice with Dilations
  • http//www.regentsprep.org/Regents/math/geometry/G
    T3/PracCoD.htm

9
Homework
  • Work Packet Dilations
Write a Comment
User Comments (0)
About PowerShow.com