Lesson Plan College of Saint Benedict/Saint John’s University Title of Lesson: Triangles, Triangles, TrianglesGrade Level: 4th Grade Process Standard(s): connections, reasoning and proof, and communication

NCTM or Minnesota Academic Standards:

4.3.1.1Describe, classify and sketch triangles, including equilateral, right, obtuse and acute triangles.

Objectives: (Avoid activities)What will the students know or be able to do?

Students will be able to classify equilateral, right, obtuse and acute triangles.

Rationale:1. Why is the lesson important? 2. How does it relate to prior learning? 3. How does it relate to future learning?

This lesson is important because it helps students begin to identify different shapes and their properties. Students will be able to classify these triangles by their properties. It relates to prior learning because students will begin to sketch these triangles using the necessary tools based on the knowledge that they have previously learned on the properties of different types of triangles. An example of a time students will use this knowledge is when they are doing arts and crafts. For example, if a student is making a quilt using triangles for their grandmother, he or she will need to know how to sketch the different types of triangles to match throughout the quilt and fit nicely.

Materials/Preparation Needed:Real-life photographs containing different types of triangles, protractors, lined piece of paper, square corner, ruler

List and define:1. discipline specific language:

● Triangle: A 3-sided polygon● Type (of triangle): classification of a triangle based on its properties● Property: characteristic of a triangle (angle measurement, side length, etc.)● Angle: measurement of the space between two intersecting lines, typically measured in degrees● Side Length: measure of the distance between two points in a triangle● Obtuse Triangle: triangle has one angle greater than 90 degrees● Equilateral Triangle: triangle has three sides of equal length and three equal angles● Acute Triangle: all three angles of a triangle are smaller than 90 degrees● Right Triangle: triangle has a 90 degree angle● Protractor: a tool for measuring angles, typically in the form of a flat semicircle marked with degrees

along the curved edge

● Square Corner: used to measure 90 degrees● Ruler: tool for measuring length● Congruent : equal in measurement

2. academic language:● Review: to cover/explain something again● Reminder : telling or showing a student again to refresh their memory● Explain: to describe● Picture : photograph● Tools: objects used to measure different properties● Classify: to put into groups or categories by characteristics or properties● Record: to write down● Exit slip: tool for assessment

Anticipatory Set: Five minute maximum1. How will you introduce objectives? 2. How will you motivate?(Avoid: “What did we talk about yesterday?” Checking homework is part of the procedure, not the set.)To introduce the objectives for this lesson students will gather around in the front of the room. They will be seated on the carpet in front of the smart board. Together we will watch this triangle video. https://www.youtube.com/watch?v=JQUTVgT9RXY It reviews all the different types of triangles that are in our objective while providing real world examples like our lesson does. This will motivate students by getting them excited about the song they can learn to help them remember the different types of triangles.

After watching the video ask students● How do I know that a triangle is equilateral?● If a triangle is obtuse what does that mean? What do the angles need to look like?● If someone is feeling confident in their knowledge about acute triangles, could I have a volunteer to

come draw one on the board?(5 min)

Procedure:Before the lesson is started the class will review the poster of the properties of the triangles they made together the other day. This poster describes triangles by side length and also by angle. It will be hanging in front of the room to give the kids a reminder of the angles while they are completing their activity. (5 min)Students will start the lesson by sitting in their desks while the directions are being explained. Tell students to

get out a lined piece of paper and title it Realworld Triangles and number the page 1-12.

On the back table will be 12 pictures of triangles in everyday life, such as a sailboat, piece of a bicycle, and many more. One at a time partners will go pick out a picture. Then, they will use their tools, such as a protractor, square corner, or ruler to classify each triangle. Make sure they record Triangle #1 next to number one on your recording sheet. If students are feeling up to it, they can add more real world triangle examples and the type of triangle that they are that we did not cover in this lesson at the bottom of their paper.

(30 min)

While the groups are working, make sure to check in with each of the partners to check for understanding. Ask them questions such as:

● What type of triangle is this?● How do you know?● What properties helped you classify this triangle?● What do you call two sides that are equal? (congruent)● How many obtuse angles can an obtuse triangle have?

As students finish up their work, begin correcting the their recording sheets as a class.

Assessment of Learning: Assess all objectives.1. List tool of assessment . 2. List what you are looking for(Example: 1. Hand signals (tool) sums 1-10 (what you are looking for) 2. Worksheet (tool) solve word problems sums 1-10 (what you are looking for)

1 Beginning 2 Developing 3 Proficient 4 Exceeds

Students will be able to classify equilateral, right, obtuse and acute triangles correctly, but are beginning to

Students will be able to classify most equilateral, right, obtuse and acute triangles on their recording sheets and are

Students will be able to classify equilateral, right, obtuse and acute triangles.

Students will be able to classify equilateral, right, obtuse and acute triangles and record examples of additional

understand what properties make different types of triangles.

understand the properties of different types of triangles.

real life objects that contain different types of triangles.

Closure: When? How long?1. How will objectives be summarized? (Giving homework and cleaning up and reminders of upcoming events are part of the procedure, not the closure.)

For our closure students will be asked to complete a 3-2-1 exit ticket. For this they will need to provide three things the learned, two important details they need to remember, and one question they still have about classifying triangles.

Accommodations:1. How will you support students who struggle academically? 2. How challenge advanced students?3. How will you provide for different learning styles?

Students who struggle academically already have the opportunity to work with a partner (someone that was pre-selected that they work well with) who they can ask questions to for peer guidance during the lesson. Each set of partners will meet with the teacher during the lesson to check in on understanding. There will be the poster describing the various properties of triangles in the front of the room. In addition, if the need extra enrichment on triangles a separate activity will be provided for them to work on at another time.

Students will be given the chance to come up with more real world examples of these triangles and record them on the bottom of their answer sheet. This will add a little bit of a challenge to the lesson.

Auditory-musical: The song/video during the anticipatory set is a catchy and musical way to reinforce the objectives and a fun way to think about triangles. Students that learn better through musical would enjoy watching and listening to this song. It might help them understand the concepts better.

Interpersonal: Students will have the chance to work with a partner, so they will have someone to ask questions and help them think through this activity.

Visual: This lesson is full of various real world examples of triangles, drawn out examples on the poster, and then the video also showed triangles. This lesson would be really helpful to a student who need to see pictures and processes in a spatial way.