What a long week…every Friday I feel it. There were some great moments this week though.

On Tuesday, the 9th graders in my Honors Geometry were at an assembly. Just enough kids that would make it a pain to move on with the remaining 8th graders (they come up from the 3 middle schools to take the course a year early). I was at first struggling with the thought of what to do…and then MTBOS! Of course we would spend some time with WODB and counting dots! This group of kids got into it! They were all geeking out over it, not worrying about others thinking they weren’t cool. Love that these kids have a place to enjoy math!

In AP, we were working with the definition of the derivative. Since it’s BC, chances of them seeing this on their test are low. They do need to recognize the functions and the difference between average and instantaneous rate of change. On Facebook someone posted a picture of an activity that looked intriguing to me as an opener. Rather than rewriting the cards every year, I typed the expressions on “cards” and I plan to laminate them when I get a chance. It turned out to be an ok activity 2nd hour…but so much better 3rd as usual after an hour of experience!!


Yesterday, as part of my basic derivatives lesson we worked on this Desmos activity to “discover” the derivative of sine and cosine. The kids found it very useful to remember how those derivatives happen!

Sine Cosine

I forget where I found the links but I know it was in the #mtbos.

And to top the week off…Math with Bad Drawings came in the mail today! I had a stack of papers to check, but not sure I’m going to get to them now!!

Honors Geometry Unit 5-Polygon Properties

Another #MTBoSBlaugustpost!!!

I created a lot of items for this unit last year. Strange because of how busy I was with my AP Calc class, but nonetheless, here you go!

Polygon Angle Conjectures are first up. We begin with an investigation and sum this up with some conjectures. Students have different shapes on the back of the chart. They answer the row according to their shape and walk around to find others who have different shapes.

Kites and Trapezoids are the first quadrilaterals we talk about. Within the notes there is some investigation work we do to complete the conjectures. I do this on patty paper. I made these flip book notes last year.

And the LHS of each is a short reinforcement worksheet. Kite Trapezoid

We first discusses midsegments in the construction unit. Here we continue the discussion with a few conjectures. I don’t have anything exciting for this topic. The students are usually amazed at the triangle conjectures. Yeah, my students are a little nerdy! Most are 8th graders that come to the high school from the middle schools to take the class.

And then there are parallelograms. I made up most of the items, though I got some ideas and worksheets from Mrs. E’s blog. Especially when teaching AP Calc for the first time this year, like I did, other teacher’s ideas and work is so much appreciated!!

I do some coordinate proofs, again some things from Mrs. E. I made this up:

I then do some quadrilateral proofs, mostly for the thinking exercise. I used to do so much more and I think they are great for reinforcing the ideas in the unit but it usually comes at the end of the term. Exams come up and ruin all the fun.

Honors Geometry Unit 4…Triangle Properties

Day 2 of #MTBoSBlaugust!!!

This unit will focus again on what’s in my Interactive Notebook, but there is a proof activity I found from All Things Algebra. Other class activities are done depending on the needs of my students. I’m always chainring things, so who knows if theirs is how my unit will look this year!

The unit begins with a triangle sum activity I found on Math by Tori‘s site. Here are pictures including a proof.

They practice this with a worksheet from Mrs. Newell‘s page and one I created.

This is followed up by Exterior Angle Theorem which uses similar activities from the same sites.

Is it a triangle and Triangle Inequality activities are next. Students use snap together sticks (AngLegs) and this worksheet I think I found on Misscalcul8’s page a while ago to investigate what makes a triangle and I sum the activities up in notes from Mrs. Newell.

Finally, we get to congruent triangles, starting with a review of how we know things are congruent… the spacing may need to be adjusted.

Many activities to reinforce the shortcuts. Notes from Mrs. Newell

A cut and paste activity from TpT

And practice

Finally, proofs! Mrs. E and Mrs. Newell have a lot of proof tips for students on their sites.


Thanks for reading!

Honors Geometry Unit 3- Tools of Geometry

Today is August 1st…and a girl from work posted on FB “August 1st is the worst”. It can mean thinking about work again, and working is worse than playing! But August 1st also means #Blaugust!

Unit 3 in Geometry means Constructions! I love constructions, though not all kids tend to feel that same love. It seems that less and less emphasis is put on constructions since no standardized tests ask students about them, but I think a lot of learning and investigating can be done with just the basics.

The first page in my notebook is a Basic Constructions instruction booklet I found from Crazy Math Teacher Lady.

I use this throughout the first few days of the unit, introducing each separately and giving the students practice time.

I use compasses and patty paper.

Segment/perpendicular bisectors lead to a couple of conjectures (Theorems the students discover) and some other vocabulary.

I’ll try to remember to post some links to these when I get into school. I don’t have them in my Dropbox right now.

Altitude is another use for perpendicular lines. (The link is .docx, so the font and spacing may be a little off. Sorry!)

This gives us skills to construct squares and rectangles too.

The last construction skill that is important to me is angle bisectors.

I did constructing parallel lines by duplicating angles last year, but am struggling with the necessity. It does reinforce what we learned last chapter. I still have to give that more thought.

I wrap the unit up with Points of Concurrency. This is my page from last year…

I read a post today that may have me rethink the end to my unit. Give Me a Sine has an awesome PBL project I’m thinking of adapting to my class. Students need to answer the question “where should the grocery store be built?” to help people in “food deserts” (watch the video).

I want to find some constructions activities for classroom practice. Homework didn’t work well this chapter especially if the students did not fully understand what they were supposed to do at first.

Unit Two Logic Honors Geometry

I want to say first and foremost, many of my ideas and inspirations for this unit came from a couple fantastic blogs. First, Mrs. E Teaches Math, and also Meg Craig! Thank you for sharing what you do with all of us! Many of the pictures you see here are because of their creations. Teaching is a lot of inspiration from others. #MTBOS on Twitter is a great start if you haven’t found it yet!

First a little Inductive Reasoning

Then logic vocabulary.

Deductive Reasoning is next.

Here are my deductive reasoning notes.

Next we investigate about angle pairs and do a little introductory proofs. I am thinking of making these proofs a little simpler, as I have a lot of 8th graders in this class and they’re not always ready for this many steps.

The Linear Pair/ Vertical Angles investigation can be found here.

Finally, I wrap the chapter up with some Parallel Lines work and a little more proof.

There are many cut and paste proof activities out there. I find these best to get the students to think about a logical order. They are not going to be perfect at Geometric proof at first. It takes work!

Unit One Honors Geometry

It has been a while since I have blogged (at all), but specifically about Honors Geometry. Some have asked about my INB pages recently, so this is probably the most efficient way to share! I use so much from others helpful sites too. Hopefully I am able to link you to their sites as well, accurately!

Our first unit is the language of Geometry and getting the students to write definitions precisely. Some pages are similar to ones I have used in the past. We start with the basics…

Link here

I don’t have the link to the above notes right now. Sorry!

I also do an activity similar to the one here, except I laminated and students work together to complete.

Next, my students review some Algebra with segments on papers I got from Mrs. Newell’s site. And I made up a practice paper.

Here is the file.

We then move on to Angles. Again, I modified some ideas from Mrs. Newell (angle pairs) and made up some work myself.

Next, polygons and triangles.

The right side of triangles I found on Mrs. E’s site. The LHS is mine.

More definitions, this time polygons.

And finally, a lot of circle definitions from Mrs. Newell.

That’s unit one! Unit Two is another mix from many sources. Maybe I’ll get a chance to go through it soon!

Honors vs Non-Honors

There are many instances in my classes where I tell my students “This is where you earn your honors points.” At our school, students earn an extra half point for taking a class with honors in the title and an extra point for an AP class. This is to reward/encourage students to take the more challenging version of the courses, or just the challenging course if there is no other non-honors counterpart.

This year I taught both Honors Geometry and Geometry (skinny version). The skinny version of Geometry is slightly different from the Block Geometry we have and from the Honors Geometry class. Some of the time, Geometry is Geometry, and there are things we need to do regardless of the class. Sometimes students “earn” their points in Honors, whether it is through tougher problems on assignments and assessments, the speed at which we work on topics or through the level of notes we take together in class. Here is an example of Honors Geometry note for Special Parallelograms…

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hon geom special parallelograms notes

Pretty basic and right to the point. Students have to spend some time sorting through what makes something a square versus a rectangle versus a rhombus on their own after we talk about what determines each special parallelogram. Then students summarize their thinking by completing a table, checking the quadrilaterals and their properties.

As far as Skinny Geometry goes, a little more time and instruction is necessary for students to completely grasp the concept and we spend more time sorting through the differences together. Here are some pictures from our interactive notebook:

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Then we get into the coordinate proofs:

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We do additional work in class, including a coordinate proof maze I made up in both classes. we complete them a little differently in each class…both being partner work though. In skinny, time is also spent on the properties with a card sort. We did not have time to play the card sort as a game (spoons or go fish) but that is something I would like to make time for in the future.