Unit 1, Lesson 4, Grade 2 icon
Unit 1, Lesson 4

Special Quadrilaterals - Rectangles

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Rather than being given step by step directions as to how to create a rectangle, students are reminded of the right angle they created in the previous lesson, and then given the task of creating a quadrilateral that has 4 right angles. By then justifying that their constructions are quadrilaterals with 4 right angles by comparing all four angles to the right angle that they created in the previous lesson, students develop the ability to construct viable arguments and justify their ideas with mathematics. Use the techniques they developed in the previous lesson for constructing right angles to create a quadrilateral with four right angles (a rectangle). Students will use the techniques for forming a right angle that they used in the previous lesson to create a quadrilateral with four right angles.

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