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Published on March 10, 2014

Author: nglaze10

Source: slideshare.net

Problem 5.1 A. Use what you know about similar triangles to find the buildings height from the given measurements. Explain your work. B. As a class choose a building or other tall object. Work with your group to estimate the objects height using the shadow method. Include the measurements your group made, and explain in words and drawing how you used these measurements to find the objects height

5.1 FOLLOW UP  1. 2. As a class we will share the data each group found for their tall object/building. Create a line plot of the data. What does the line plot tell you about the objects height?

Welcome to Pre-Algebra! 1. Please have your homework on your desk and get started on your warm up. 2. Sketch the Graph 3. Please have out your spiral notebooks – 5.2 Using Mirrors to Find Heights

THINK ABOUT THIS  As you work on this investigation think about this question: Can you explain why each angle of the large triangle is equal to the corresponding angle of the small triangle?

USING MIRRORS TO FIND HEIGHTS The shadow method is useful for estimating heights, but it only works if you are outside on a sunny day.  In this problem we will use a mirror to help estimate heights. The mirror method works both indoors and outdoors. 

SCENARIO  Jim and Qin-Zhong, students in Mr. Anwar’s class, are using the mirror method to estimate the height of their school building. They have made the follow measurements and sketch: Height from the ground to Jim’s eyes: 150cm Distance from the middle of the mirror to Jim: 100cm Distance from the middle of the mirror to the building: 600cm

5.2 FOLLOW UP  1. Work with your teacher to pool the results from all of the groups. Make a line plot of the data.  2. Compare the line plot of the estimates you made using the mirror method to the line plot of the estimates you made using the shadow method. Which method seems to give more consistent results?

WELCOME TO PRE-ALGEBRA ! TUESDAY/WEDNESDAY/ THURSDAY 1. 2. 3. 4. Please copy your homework in your agenda. Finish & Discuss 5.2 5.3 Using Similar Triangles to find distance Assignment  Workbook p. 184 - 186

5.2 FOLLOW UP  1. Work with your teacher to pool the results from all of the groups. Make a line plot of the data.  2. Compare the line plot of the estimates you made using the mirror method to the line plot of the estimates you made using the shadow method. Which method seems to give more consistent results?

USING SIMILAR TRIANGLES TO FIND DISTANCES  Mr. Anwar’s class went to Bevport pond for a picnic. Darnell, Angie and Trevor wanted to find the distance across the pond. Darnell and Angie suggested that Trevor swim across with the end of a tape measure in his mouth. Trevor declined – the water was very cold!!  They decided to try to use what they had learned about similar triangles to find the distance across the pond. They drew a diagram and started making the necessary measurements.

PROBLEM 5.3  Darnell, Angie and Trevor made the diagram below.  A. Name two similar triangles in the diagram. B. What is the scale factor from the large triangle to the small triangle? C. What is the distance across the pond? (measured along the dotted line) D. On your school campus or neighborhood, find a pond or some other feature, such as a park, a playground or a wooded area. Use the ideas in this problem to estimate across the feature. Explain your work carefully.   

5.3 FOLLOW UP  Is this large triangle Darnell, Angie and Trevor measured the only one that will work to find the distance across the pond? If you think other triangles could be used, make a drawing of Bevport Pond showing another triangle that could be measured to determine the distance across the pond. If you think no other triangles would work, explain why not.

Quarter 2: Week 8 WARM-UP:  David is using the shadow method to estimate the heights of three trees in the school yard. For each set of data, make a diagram showing the tree, the meterstick, and the shadows, and then determine the missing information. Height of tree = ?  Height of meterstick = 1m 9  Length of shadow of tree = 2  Length of meterstick’s shadow =  1 2

Quarter 2: Week 8 WARM-UP:  Charlotte is using the mirror method to find the heights of objects. Here are some of the measurements she recorded. Make a diagram for each situation, and determine the missing information. Height from the ground to Charlotte’s eyes = 1.5m  Distance from center of mirror to Charlotte= 1.5m  Distance from center of mirror to shed = ? 

1. WELCOME TO PRE-ALGEBRA! FRIDAY! 2. 3. 4. Please have your homework on your desk and get started on your warm up. Correct homework Application 5 Assignment  Finish Application 5

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