Riverside USD Scope and Sequence: 4.G.2 [4.7 ], 4.G.2 [4.8] Oklahoma Academic Standards Mathematics: 4.A.1.3, 4.GM.1.2,

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1 1 U n t er r ich t splan Classifying Triangles Altersgruppe: Grade 5, Grade 4 Texas - TEKS: G4.6.GM.C, G6.8.E E R.A, G6.8.E E R.B Riverside USD Scope and Sequence: 4.G.2 [4.7 ], 4.G.2 [4.8] Oklahoma Academic Standards Mathematics: 4.A.1.3, 4.GM.1.2, 4.GM.1.3 Virginia - Mathematics Standards of Learning (2009): 3.14, 4.12a, 4.12b, 5.12b, 5.13 a, 5.13 b Common Core: 4.G.A.2 Mathematics Florida Standards (MAFS): 4.G.1.2 Alaska: 4.G.2, 6.G.1 Minnesota: Fairfax County Public Schools Program of Studies: 3.14.a.2, 4.12.a.1, 4.12.a.2, 4.12.b.1, 5.12.b.1, 5.12.b.2, 5.13.a.1, 5.13.b.1 Nebraska Mathematics Standards: M A c South Carolina: 4.G.2, 6.GM.1 Indiana: 4.G.5, 5.G.1, 5.G.2 Georgia Standards of Excellence: M GSE 4.G.2 Virginia - Mathematics Standards of Learning (2016): 5.13.a Online-Ressourcen: P o l ygo l f Opening Teacher present s Students pract ice Math Pract ice Worksheet Closing

2 2 M at h Obj ect ives E xpe ri e nc e classification P rac t i c e identifying triangles Learn that triangles can be identified by sides or angles De vel o p geometry skills Ope ni ng 8 To each pair of students, hand out the following nine shapes. Ask the students to place the shapes into three categories. Once the students have sorted the shapes, discuss. What are the titles of your categories? Some students may have categorized by color: blue, purple, and orange. Does anyone have different categories? Some students may have categorized by shape: circle, rectangle, and triangle. Say: We can categorize these shapes in two separate ways: by color or by shape. Today, we are going to the do the same thing with triangles. We can categorize them by side length or by angle measure. Write on the board: Triangles by Sides

3 3 Equila t e ra l a triangle with all equal sides I s o s c e le s a triangle with two equal sides S c a le ne a triangle with no equal sides Triangles by Angles A c ut e a triangle with three acute angles Right h t a triangle with one right angle Obt us e a triangle with one obtuse angle Say: If we are categorizing by shape, belongs in the circle category. If we are categorizing by color, belongs in the orange category. Likewise, we can classify a single triangle in two ways: by its side length or by its angle measure. T e ac he r prese nt s M at h game : P o l ygo l f - Cl assi f y T ri angl e s 10 Present Matific s episode P o l ygo l f - Cl assi f y T ri angl e s to the class, using the projector. Example : The goal of the episode is to classify triangles.

4 Say: Please read the instruction. Students can read the instruction from the bottom of the screen. Are we considering the triangle s angles or the triangle s side lengths?

4 4 Say: Please read the instruction. Students can read the instruction from the bottom of the screen. Are we considering the triangle s angles or the triangle s side lengths? Students can answer based on the instruction. On which triangle should I click? Click on the triangle that the students indicate. If this triangle is correct, stars will appear, and the episode will direct you to click on a new triangle. If this triangle is incorrect, a small X will appear, the instructions will wiggle, and a new triangle will fall from the top of the screen. Continue to ask the students which triangle to click on as the episode proceeds. Once the ball has rolled into the hole, the episode will present two more games of golf. St ude nt s prac t i c e M at h game : P o l ygo l f - Cl assi f y T ri angl e s 10 Have the students play P o l ygo l f - Cl assi f y T ri angl e s on their personal devices. Circulate, answering questions as necessary.

5 5 M at h P rac t i c e : Cl assi f yi ng T ri angl e s Wo rkshe e t 14 Distribute paper to the students. Give them the following instructions. 1. Use the paper in the landscape position. 2. Title the right third of the paper Polygons Used. 3. Title the rest of the paper Polygon Land. 4. Under the Polygons Used title, make the following table. 5. Create a drawing underneath Polygon Land, using only straight lines and polygons. Be sure to include at least one rectangle, two right triangles, one acute triangle, and one obtuse triangle. Your drawing can be realistic or abstract. 6. In the table, record the number of each polygon you used in your drawing. You can add categories (square, trapezoid, etc.), if you wish.

6 6 7. Color your drawing. Circulate, checking students work. Collect work when the students are done, to display later.

7 7 Cl o si ng 5 True or False? An acute triangle may also be a right triangle. False. An acute triangle does not have any right angles. A right triangle has one right angle. True or False? An obtuse triangle has only one obtuse angle. True. An obtuse triangle has exactly one obtuse angle. True or False? An acute triangle may also be an isosceles triangle. True. It is possible for an acute triangle to have two equal sides. True or False? A right triangle may have more than one right angle. False. A right triangle has exactly one right angle. True or False? An acute triangle has only one acute angle. False. An acute triangle has three acute angles. True or False? An obtuse triangle may also be an isosceles triangle. True. It is possible for an obtuse triangle to have two equal sides. True or False? An obtuse triangle may also be a scalene triangle. True. It is possible for an obtuse triangle to have three different side lengths. True or False? An obtuse triangle has two acute angles. True. An obtuse triangle has one obtuse and two acute angles. True or False? An isosceles triangle may also be an equilateral triangle. True. If a triangle has two equal sides, the third may also be equal to them.

Texas - TEKS: G3.6.GM.B Riverside USD Scope and Sequence: 5.G.3 [5.6] Oklahoma Academic Standards Mathematics: 4.GM.1.2, 5.GM.1.1,

1 U n t er r ich t splan Classifying Quad rilaterals Altersgruppe: 4 t h Grade, 5 t h Grade Texas - TEKS: G3.6.GM.B Riverside USD Scope and Sequence: 5.G.3 [5.6] Oklahoma Academic Standards Mathematics: