Geometry Lesson Eight:

Angles, Sides and Properties of Quadrilaterals

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Objective: Students will demonstrate an understanding of symmetry by testing predictions with a Mira and trying to create designs that have reflective symmetry.

Grade: Three/ Four  

Length of Lesson: 1 hour

GCO: Students will demonstrate spatial sense and apply geometric concepts, properties, and relationships.

Related SCOs:

·        4E12: make generalisations about the reflective symmetry property of various quadrilaterals

Materials:

·        Mira

·        One piece of black construction paper for the background

·        Different colors of construction paper

·        Scissors  

·        Glue

Procedure:

·        Students will be asked to look for objects in the room that they believe will have lines of symmetry

·        They will be asked to go to the object with the Mira and test their theories

·        Once they have done this with the classroom objects they will be asked to construct pictures by using (quadrilateral shaped) cut up pieces of different colored construction paper and gluing them onto a piece of black construction paper background. The students should be aware that their designs should have reflective symmetry.  

·        Students will be asked to have their designs checked for reflective symmetry by their partners using the Mira or by folding the sheet of construction paper in half and comparing the two halves.

Evaluation: The teacher can determine the level of student understanding by looking at the designs the students have created and by asking questions about how they achieved (or attempted to achieve) their reflective lines of symmetry.

Inclusion Strategies:

Hearing Impaired: Visual aids will be used for those students who are hearing impaired and handouts will be given with instructions for the lesson. The hearing impaired student will be paired with a non-hearing impaired classmate and class discussion points will be written on the chalkboard for all students to see.

Visually Impaired:  Visually impaired students will be paired with a student who is not visually impaired.  These students will be given the instructions orally.  These students will be able to know what is going on in the class discussions through hearing. The student will be able to feel the shape of the quadrilateral and decide where to place it on each half the paper where they believe it would show reflective symmetry. Their partner can check the design with the Mira and make suggestions to show reflective symmetry. The visually impaired student will also be provided with models of the shapes in question so that they can feel the shape and make judgments about the properties that they feel.

Students of English as a second language:  Students where English is a second language should be provided with lots of visual support, as with students with hearing impairment.