In the 4th block of the semester, we quizzed over the basics of similarity with a 20 pt quiz. If you were absent, come Wednesday during advisory for A day quizzes, Friday for B-day.
We practiced dilation on copy paper: dilating by a scale factor, or locating center of dilation and scale factor. Next time we will practice in the coordinate plane.
We went over homework and warm-up in detail, hitting some important points for the quiz and for future understanding.
We read p 603 in the old textbook to learn about the basics of parallel proportionality, using the investigation on p 604 to discover that: If parallel segments connect two sides of a triangle, then they divide those two sides into proportional segments. We also observed that it works for multiple segments, and the converse is also true: If two sides are divided proportionally, then the segments connecting are parallel.
You will use this to do HW #4: p 395: 13,18, p 400: 1-10, 19-20. Remember that you cannot use this new idea to do problems 1-3; you use sides of similar triangles. Write proportions and solve.
And then we did the quiz for the last 25 minutes.
Remember that a test is coming soon: part A on Jan 22-23 at the end of class, part B (longer) on Jan 24-25.
Warm-up is attached below.
We practiced dilation on copy paper: dilating by a scale factor, or locating center of dilation and scale factor. Next time we will practice in the coordinate plane.
We went over homework and warm-up in detail, hitting some important points for the quiz and for future understanding.
We read p 603 in the old textbook to learn about the basics of parallel proportionality, using the investigation on p 604 to discover that: If parallel segments connect two sides of a triangle, then they divide those two sides into proportional segments. We also observed that it works for multiple segments, and the converse is also true: If two sides are divided proportionally, then the segments connecting are parallel.
You will use this to do HW #4: p 395: 13,18, p 400: 1-10, 19-20. Remember that you cannot use this new idea to do problems 1-3; you use sides of similar triangles. Write proportions and solve.
And then we did the quiz for the last 25 minutes.
Remember that a test is coming soon: part A on Jan 22-23 at the end of class, part B (longer) on Jan 24-25.
Warm-up is attached below.
similarity_unit_2019_dilation_warm-up.docx |