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Lesson Plans - Math 2A
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2-1-2005 Bring your ruler! Bring your protractor!

OBJECTIVE: •To recognize similar figures and to be able to tell why they are similar [1.3.3][1.3.1] •To understand that any two similar figures are related by a scale factor, which is the ratio of their corresponding sizes •To build a larger, similar shape from copies of a basic shape (a rep-tile) •To find rep-tiles by dividing a large shape into smaller, similar shapes •To understand that the sides and perimeters of similar figures grow by a scale factor and that the areas grow by the square of the scale factor[1.2.1][1.2.3] •To find a missing measurement in a pair of similar figures •To recognize that triangles with equal corresponding angles are similar ACTIVITIES/ASSESSMENT: Draw (not sketch) a scalene triangle#1. label and measure the angles with a protractor Bring your protractor!, label and measure the sides with a ruler Bring your ruler!. Make a table Bring your graph paper! to enter the data for 3 triangles. Draw and measure a similar triangle#2 with a scale factor of 2. Draw and measure a similar triangle#3 with a scale factor of 0.5. Explain how the area of triangle#1 relates to the area of triangle#2. Explain how the area of Triangle#3 relates to the area of triangle#2. How does the scale factor relate to the area? Use a picture to demonstrate. NOTES: HOMEWORK: Page 37 #15

2-2-2005 Bring your ruler! Bring your protractor!
Page 37 #15
Scalene Triangle Transformations

OBJECTIVE: See 2-1 above. ACTIVITIES/ASSESSMENT: Collect the homework. Collect the scalene triangle transformation paper. Using a similar process and the same scale factors, make a poster which demonstrates your understanding of the relationship between scale factor and area using a quadrilateral. (No squares or rectangles) This will be due on Friday 2-4. Poster must be done on the piece of paper distributed to you. Be sure to include all relevent data in a table. NOTES: HOMEWORK: Poster

2-3-2005 Bring your ruler! Bring your protractor!
Page 40 1-4

OBJECTIVE: See 2-1 above. ACTIVITIES/ASSESSMENT: Discuss the answers to the questions in Mathematical Reflections. Write a script for an oral report to summarize the ideas listed on page 40 1-4. Time to finalize quadrilateral poster. Introduce the metric ladder. NOTES: HOMEWORK:

2-4-2005 Bring your ruler! Bring your protractor!
Scale Factor/Area Poster
Page 43 Problem 4.2
Measure Drill

OBJECTIVE: •To use the definition of similarity to recognize when figures are similar •To determine the scale factor between similar figures to find the lengths of corresponding sides[1.1.4] •To find a missing measurement in a pair of similar figures[1.1.4] •To use the relationship between scale factor and area to find the area of a figure that is similar to a figure of a known area[3.2.1] •To solve problems that involve scaling up and down[1.1.4] ACTIVITIES/ASSESSMENT: Measure Drill; Collect Scale Factor/Area Posters on Quadrilaterals. Start on Page 43 problem 4.2 - include an accurate, labelled drawing in your solution. NOTES: HOMEWORK: P47 and 48 1-4



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