The sum of the interior angles of a polygon can be determined easily by dividing the polygon into triangles as demonstrated in the image below. The sum of the interior angles of a triangle is always 180 degrees. If a polygon contains 2 triangles, the sum of its interior angles will be 360 degrees. If a polygon contains 3 triangles, the sum of its interior angles will be 540 degrees and so on. The number of triangles multiplied by 180 will equal the sum of the interior angles of the polygon.

### Monday, February 26

Portion of plans carried over from last week.

Common Core Standards and Extended Standards

8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

Student Objectives

I can identify angles created by parallel lines intersected by a transversal.

I can identify supplementary angles.

I can identify complementary angles.

I can identify congruent angles.

I can identify acute, obtuse, and right angles.

I can identify and compute missing angle measures.

Bellwork

Students will complete *Math Minute 72*.

Link in Schoology: “State Test Practice 4”

Lesson (Sum of Interior Angles)

1. Review angle relationships:

-Quizlet angle relationships

-demonstration with transparency film to show students that all 4 acute angles and all 4 obtuse angles or all 8 right angles created when a transveral intersects parallel lines will be congruent

-hands-on drill and practice with linguine noodles and bingo chips

-Angle relationships review game

-angle relationships sorting challenge

2. Introduce parallel city map project

3. Introduction and hands-on exploration:

*GoMath*workbook explore activity one on page 353, explore activity two on page 354 with patty paper

4. Journal entry, demonstration, and online practice with IXL: interior angles of a triangle (O.5), interior angles of quadrilaterals (O.6), interior angles of polygons (O.8)

5. Independent practice: IXL module 11, interior angles maze, parallel city map project, parallel lines worksheet

Closing

IXL O.1 Identify and classify polygons

IXL O.2 Classify triangles

IXL O.3 Classify quadrilaterals

IXL O.4 Graph triangles and quadrilaterals

Homework

You will have a quiz over angle relationships tomorrow. Complete the parallel lines worksheet. You will have a basic geometry test on Friday. Type “angle relationships” into the search box on any page of this website to go to videos and games that you can use to review concepts. You may also use the interactive lessons and assignments for module 11 on the textbook website. Complete “Identifying Angle Relationships” in the Schoology parallel lines folder. The parallel city map project is due on Friday. The IXL module 11 to-do list is due on Friday.

### Tuesday, February 27

Common Core Standards and Extended Standards

8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

Student Objectives

I can identify angles created by parallel lines intersected by a transversal.

I can identify supplementary angles.

I can identify complementary angles.

I can identify congruent angles.

I can identify acute, obtuse, and right angles.

I can identify and compute missing angle measures.

Bellwork

Students will complete *Math Minute 73*.

Quizlet: angle relationships or geometry terms

Lesson (Angle Relationships Quiz/Exterior (Remote) Angle Theorem)

1. XtraMath challenge

2. Go over homework.

3. Angle relationships review: hot seat game

4. Journal entry, demonstration, and online practice with IXL: exterior (remote) angle theorem (O.7), sum of exterior angles, explore activity three on page 356, prove exterior angle/remote angle theorem with patty paper,

5. Angle relationships quiz in Google forms, link in Schoology course

6. Independent practice: IXL missing angles, interior angles, parallel city map project

Closing

Exit ticket:

Homework

Complete page 277 in your workbook. You will have a basic geometry test on Friday. Type “angle relationships” into the search box on any page of this website to go to videos and games that you can use to review concepts. You may also use the interactive lessons and assignments for module 11 on the textbook website. The parallel city map project is due on Friday. The IXL module 11 to-do list is due Friday.

### Wednesday, February 28

Common Core Standards and Extended Standards

8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

Student Objectives

I can identify angles created by parallel lines intersected by a transversal.

I can identify supplementary angles.

I can identify congruent angles.

I can calculate a missing angle measure in a triangle or quadrilateral.

I can identify the sum of the exterior angles of a polygon.

I can determine the sum of the interior angles of a polygon.

I can identify and compute missing angle measures.

I can determine if two triangles are similar.

Bellwork

Students will complete *Math Minute 74*.

Link in Schoology: “State Test Practice 5”

Lesson (Angle-Angle Similarity)

1. Go over homework.

2. Essential question: “How can you determine when two triangles are similar?” If 2 angles in a triangles are congruent to two angles in a second triangle, the two triangles are either similar or congruent triangles.

3. Journal entry:

4. Demonstration: similar figures

5. Journal entry:

6. Guided practice:

*GoMath*workbook page 366

7. Independent practice: IXL congruent figures, congruence statements, pages 367 and 368 (#5-11) in

*GoMath*workbook, parallel city map project

Closing

Journal entry:

Homework

You will have a basic geometry test on Friday. Type “angle relationships” into the search box on any page of this website to go to videos and games that you can use to review concepts. You may also use the interactive lessons and assignments for module 11 on the textbook website. Finish the geometry review packet. It is due on Friday. The parallel city map project is due on Friday. The IXL module 11 to-do list is due on Friday.

### Thursday, March 1

Common Core Standards and Extended Standards

8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

8.EE.6 Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b.

Student Objectives

I can identify angles created by parallel lines intersected by a transversal.

I can identify supplementary angles.

I can identify congruent angles.

I can calculate a missing angle measure in a triangle or quadrilateral.

I can identify the sum of the exterior angles of a polygon.

I can determine the sum of the interior angles of a polygon.

I can identify and compute missing angle measures.

Bellwork

Students will complete *Math Minute 75*.

IXL, geometry: C.1 Angle vocabulary & B.1 Lines, segments, and rays

Lesson (Geometry & Algebra/Basic Geometry Review)

1. Go over homework.

2. Demonstration, journal entry & guided practice: using algebra to find angle measures

3. Kahoot!-Transversals

3. Cooperative practice: parallel lines & angles math lib

4. Independent practice: finish geometry review worksheet, parallel city project, IXL module 11 to-do list

Closing

IXL module 11 to-do list items

Homework

Complete the remaining items on the basic geometry review worksheet. The test over basic geometry has been postponed until Tuesday. The parallel city map project is due on Friday, March 9 (new due date). The IXL module 11 to-do list is due Tuesday before the geometry unit test (new due date).

### Friday, March 2

Common Core Standards and Extended Standards

8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.

8.EE.6 Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b.

Student Objectives

I can identify angles created by parallel lines intersected by a transversal.

I can identify supplementary angles.

I can identify congruent angles.

I can calculate a missing angle measure in a triangle or quadrilateral.

I can identify the sum of the exterior angles of a polygon.

I can determine the sum of the interior angles of a polygon.

I can identify and compute missing angle measures.

Bellwork

Students will complete *Math Minute 76*.

Lesson (Basic Geometry Test/STAR Math Benchmark)

1. Go over homework.

2. Review big ideas.

3. Dance, dance transversal competition

4. Geometry test (postponed until Tuesday)

5. STAR math benchmark without calculators

6. IXL modules 11 to-do list to be turned in at the end of the period

Homework