Today is the first block of the new semester! We will be testing Similarity and Dilation on January 24-29. There will be a 20 pt quiz on Fri-Tues, Jan 17-21.
We started class with info about final and semester results. 0B viewed their exams and wrote self-evaluations.
We then did a dilation activity given a triangle and its dilation, to find the center of dilation and the scale factor. This brings back content from early December.
Today we spent a good bit of class working on using the concepts of ratio and proportion algebraically, verbally, and geometrically. The definition of similar polygons states that corresponding angles are congruent and corresponding sides are proportional, so we will need to be able to write and solve proportions easily in this unit. In the old textbook, we did pp 561-2:1-12, 14, 15, 17.
We made sure that we had two definitions in our GT: dilation and similar polygons (with good examples). Two conjectures should be included: All circles are dilations of each other. All circles are similar. AND If two polygons are dilations of each other, then the polygons are similar. (Dilation and similarity are the same thing.)
Then we used the definition to answer and explain why two polygons are similar or not. We also used the definition to write proportions to find missing sides of similar figures.
HW #1: pp 378-80: 1-6, 8-16, 19. You will need graph paper.
To find the problems that we did in class today, go to flourishkh.com and log in to the online textbook (username is first part of your gmail, password is 5-digit lunch code, pin is 72703A). Instead of entering the textbook, click on Practice Algebra Skills, then pick Ratios and Proportions. You will find the same problems as the old textbook.
Graph paper was distributed in class. If you don't have any, google "graph paper pdf" and print a page.
We started class with info about final and semester results. 0B viewed their exams and wrote self-evaluations.
We then did a dilation activity given a triangle and its dilation, to find the center of dilation and the scale factor. This brings back content from early December.
Today we spent a good bit of class working on using the concepts of ratio and proportion algebraically, verbally, and geometrically. The definition of similar polygons states that corresponding angles are congruent and corresponding sides are proportional, so we will need to be able to write and solve proportions easily in this unit. In the old textbook, we did pp 561-2:1-12, 14, 15, 17.
We made sure that we had two definitions in our GT: dilation and similar polygons (with good examples). Two conjectures should be included: All circles are dilations of each other. All circles are similar. AND If two polygons are dilations of each other, then the polygons are similar. (Dilation and similarity are the same thing.)
Then we used the definition to answer and explain why two polygons are similar or not. We also used the definition to write proportions to find missing sides of similar figures.
HW #1: pp 378-80: 1-6, 8-16, 19. You will need graph paper.
To find the problems that we did in class today, go to flourishkh.com and log in to the online textbook (username is first part of your gmail, password is 5-digit lunch code, pin is 72703A). Instead of entering the textbook, click on Practice Algebra Skills, then pick Ratios and Proportions. You will find the same problems as the old textbook.
Graph paper was distributed in class. If you don't have any, google "graph paper pdf" and print a page.