7 th grade math lesson objective students will find the perimeter and area of similar figures
This presentation is the property of its rightful owner.
Sponsored Links
1 / 8

Perimeter and Area of Similar Figures PowerPoint PPT Presentation


  • 191 Views
  • Uploaded on
  • Presentation posted in: General

7 th Grade Math Lesson Objective: Students will find the perimeter and area of similar figures. Perimeter and Area of Similar Figures. Concept – Perimeter. How to find Add each side length of an object Similar Figures Rule P (New) = P (Original) • SF Scale Factor New / Original.

Download Presentation

Perimeter and Area of Similar Figures

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


7 th grade math lesson objective students will find the perimeter and area of similar figures

7th Grade Math

Lesson Objective:

Students will find the perimeter and area of similar figures.

Perimeter and Area of Similar Figures


Concept perimeter

Concept – Perimeter

  • How to find

    • Add each side length of an object

  • Similar Figures Rule

    • P(New)= P(Original)• SF

  • Scale Factor

    • New/Original


Example 1

Example 1

  • Two rectangles are similar. One has a length of 6 inches and a perimeter of 24 inches. The other has a length of 7 inches. What is the perimeter of this rectangle?

SF = 7/6

P = 24 • 7/6

P = 28 in


Example 2

Example 2

L

P

18 m

24 m

Q

R

M

N

P = 64 m

LMN is similar to PQR

P = 64 • 3/4

SF = 18/24 or 3/4

P = 48 m


Concept area

Concept – Area

  • How to find

    • Rectangle = bh

    • Triangle = ½bh

  • Similar Figures Rule

    • A(New)= A(Original)• SF2

  • Scale Factor

    • New/Original


Example 3

Example 3

  • The Eddingtons have a 5-foot by 8-foot porch on the front of their house. They are building a similar porch on the back with double the dimensions. Find the area of the back porch.

A = 40 • 22

SF = 2

A = 40 • 4

A = 160 ft2


Example 4

Example 4

  • Malia is painting a mural on her bedroom wall. The image she is reproducing is 1/20 of her wall and has an area of 36 square inches. Find the area of the mural.

A = 36 • 202

SF = 20

A = 36 • 400

A = 14,400 in2


Example 5

Example 5

  • A company wants to reproduce the size of its logo by one fourth to use on business cards. If the area of the original logo is 4 square inches, what is the area of the logo that will be used on the business cards?

A = 4 • (¼)2

SF = ¼

A = 4 • 1/16

A = 0.25 in2


  • Login