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What's My Size? - Teacher Information
This lesson is divided into three parts. Part I is a review of ratio and proportion and how it can be used to determine the height of an object. Practice is provided on this concept. Part II teaches the students to use the Scion Image software. Part III is where the students will use Scion Image to determine the radius of the highway curve to continue with the work on the module.
Part I - Ratio and Proportion
Students will be told later in the lesson the height of the fire hydrant. The fire hydrant is 30 inches. You can make a good guess by comparing the height of the fire hydrant to the pole. Students should see that if you put two fire hydrants together it is almost the same height as the pole. Some students may give their guess in feet. There will be an opportunity later for the students to practice converting from feet to inches. You may want to use this as an opportunity to review this concept by giving a short homework assignment. In the second picture, the students will need to look at height of the camper truck to estimate the height of the light pole. The height of a camper truck is approximately 5.75 feet. Here is another opportunity to work with converting measurements using fractions and decimals in the numbers. Students should visualize how many trucks would stack up to be as tall as the light pole and then estimate the height of the light pole.
Answers for Practice Problems
a. 12ggggg b. 1.6ggggg c. 18gggg d. 135, 37.8, 4, .5
e. 320/3, 32/15, 6, 15
Part II Using Scion Image
Scion Image is free software and can be downloaded atf http://www.scioncorp.com/.
You will need to download the images on the computer to use in scion image. Click on the links below and save the image onto your computer or a disk. You will need these pictures to do this lesson. Some browsers can not read .tif and .bmp files so the pictures were not displayed on this page but you should be able to open them. Make sure that you save them as a .tif or .bmp. Paint will do this for Windows users.
If you have a problem getting these pictures you can try to download this zipped file which contains the files you will need. Click here for a down load. Remember to unzip them before you try to use them.
Answers may vary due to the placement of the cursor and the accuracy in measuring the object.
Fire hydrant in pixels - 115 pixels
Scale: 3.833 pixels per inch
Height of the post - 209 pixels
Height of the post - 54.52 inches
Students should use the numbers to calculate the height of pole before they have Scion Image do the calculations.
Camper Truck in pixels - 18 pixels
Scale: 3.13043 pixels per foot
Height of the pole - 295.01 pixels
Pixels Height of the pole - 94.24 feet
Remind students not to SAVE when they finish the exercise.
Part III - Measuring the Curve
To find the radius of the curve, students will measure the scale at the bottom of the picture, use 100 meters as the known distance, and then measure the radius of the circle to find the radius of the curve. The students may need to move the picture up to see the scale on the picture. The radius of the inside curve will be approximately 68 meters and the radius of the outside curve will be approximately 74 meters. Answers will vary depending on the accuracy of the student doing the measuring in Scion Image.
