In the 4th block of the semester, we quizzed over the basics of similarity with a 20 pt quiz. If you were absent, come Tuesday during advisory to make it up.
We practiced dilation problems on the coordinate grid from PARCC released items (attached below). The last problem has to be done carefully on graph paper to find the correct center of dilation.
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:
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.
We looked at the proof of this on p 605 in the old book. It is easy to understand.
You will use this to do HW #4: p 395: 13,17, p 400: 1-6,8-9, 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 24-27 at the end of class, part B (longer) on Jan 28-29.
We practiced dilation problems on the coordinate grid from PARCC released items (attached below). The last problem has to be done carefully on graph paper to find the correct center of dilation.
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:
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.
We looked at the proof of this on p 605 in the old book. It is easy to understand.
You will use this to do HW #4: p 395: 13,17, p 400: 1-6,8-9, 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 24-27 at the end of class, part B (longer) on Jan 28-29.
dilation_practice.pdf |