Education Technology

# Activities

• ##### Subject Area

• Math: Geometry: Similarity and Proportion

6-8

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 12 from the EXPLORATIONS Book:
Developing Problem-Solving Skills with the TI-15

The following materials are required for this activity:
• Toy truck or car with scale indicated
• Color tiles
• Paper and pencils
• Chart paper and markers

## Proportional Flag

#### Activity Overview

Students will use the concepts of similarity to create a scale drawing of the national flag, that is large enough to cover most of a football field.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 80 - 86 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Understand that similar figures have proportional dimensions, and figures with proportional dimensions are similar
• Analyze and record the dimensions of the flag and the football field
• Study and record the length to width ratio of the flag and the field
• Enter the ratios as fractions in the calculator
• Check if the fractions are in their simplest terms, and if they are equal
• Decide whether the flag and the field are similar figures
• Draw a scale model of the football field flag
• Label the length and width of each section of the flag, including the diameter of one star
• #### After the Activity

Students calculate the amount of fabric that will be needed to create the flag.

• Review student results
• As a class, look at the diagrams presented and note any similarities and differences
• Re-teach concepts as necessary