Identify and Classify Quadrilaterals
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1 5 Objective Identify and Classify Quadrilaterals In this lesson, students investigate the properties of quadrilaterals by making models. They learn that some quadrilaterals can be classified in more than one way. Knowing the properties of quadrilaterals prepares students to find area and volume. Common Core State Standards 5.G.3 5.G.4 Talk About It Discuss the Try It! activity. Ask: Why can neither student make a trapezoid? Ask: What type of AngLegs piece would you need to make a trapezoid? Which quadrilaterals have all right angles? Solve It Reread the problem with students. Have them sketch each of the quadrilaterals and justify why they can or cannot make the quadrilaterals given each set of AngLegs. Have students compare their sketches. More Ideas For other ways to teach about identifying and classifying quadrilaterals Have students use Pattern Blocks to identify and classify as many quadrilaterals as possible. Challenge them to combine shapes to build any type of quadrilateral that is missing from the Pattern Blocks set. Have students work in pairs. The first student describes at least three characteristics of a quadrilateral and the other student makes the quadrilateral on a Geoboard. The two students classify the quadrilateral in as many ways and as specifically as possible. Formative Assessment Have students try the following problem. Which best describes the quadrilateral? A. parallelogram B. rectangle C. rhombus D. square 112
2 Try It! 25 minutes Pairs Here is a problem about identifying and classifying quadrilaterals. Owen and Lili are using AngLegs to model shapes for an art project. Owen has 2 and 2 AngLegs. Lili has 4 green AngLegs. How many quadrilaterals can each student make? Introduce the problem. Then have students do the activity to solve the problem. Distribute AngLegs, charts, and pencils to students. Say: Figures with four sides and four angles are quadrilaterals. Materials AngLegs (2, 2, and 4 green per pair) Quadrilaterals Chart (BLM 4; 2 per pair) paper (2 sheets per pair) pencils (2 per pair) 1. Tell students to refer to the chart and note the characteristics of a trapezoid. Then have them determine whether they can build a trapezoid. Tell students to mark the appropriate column yes or no at the bottom of the sheet. 2. Instruct students to repeat this process for each of the shapes listed in the chart. Have students tally the yes and no responses. Some students may think that since any rhombus, rectangle, or square is a parallelogram that any parallelogram also must be a rhombus, a rectangle, and a square. Guide students to see that by definition a square, rectangle, and rhombus have special characteristics. 3. Have students note the similarities that exist among some of the shapes. Discuss, for example, that a square is a special rectangle, and that a rhombus is a special kite. 113
3 Lesson 5 Name Answer Key Use AngLegs to model each quadrilateral. Identify its characteristics. Name the quadrilateral. (Check students work.) green blue 4 congruent sides, 4 right angles, 2 sets of parallel sides; square one set of parallel lines; trapezoid Using AngLegs, model each quadrilateral named. Sketch the model. 3. rectangle Check students sketches. 4. parallelogram Check students sketches. Identify each quadrilateral by name. Name the characteristics of the figure rhombus; 2 sets of parallel sides, 4 congruent sides _ rectangle; 2 sets of parallel sides, 4 right angles, 2 sets congruent sides _ square; 2 sets of parallel sides, 4 right angles, _ 4 congruent sides 114 Hands-On Standards, Common Core Edition Download student pages at hand2mind.com/hosstudent.
4 Answer Name Key Challenge! What do all quadrilaterals have in common? What do all parallelograms have in common? Name all the specific types of parallelograms and draw a picture of each. Challenge: (Sample) All quadrilaterals have four sides; All parallelograms have two sets of parallel lines; square, rectangle, rhombus Download student pages at hand2mind.com/hosstudent. Hands-On Standards, Common Core Edition 115
5 Lesson 5 Name Use AngLegs to model each quadrilateral. Identify its characteristics. Name the quadrilateral green blue Using AngLegs, model each quadrilateral named. Sketch the model. 3. rectangle 4. parallelogram Identify each quadrilateral by name. Name the characteristics of the figure _ 114 Hands-On Standards, Common Core Edition
6 Name Challenge! What do all quadrilaterals have in common? What do all parallelograms have in common? Name all the specific types of parallelograms and draw a picture of each. Hands-On Standards, Common Core Edition 115
7 Name BLM 4 Name Properties of Quadrilaterals Number of Pairs of Parallel Sides Number of Congruent Sides Number of Right Angles Trapezoid 1 0, 2, or 3 0 or 2 Parallelogram 2 2 or 4 0 or 4 Rhombus or 4 Square Rectangle 2 2 or 4 4 Kite 0 or 2 2 or 4 0, 1, 2, or 4 Quadrilaterals Chart Can you make the shape? Owen Lili Shape Yes No Yes No Trapezoid Parallelogram Rhombus Square Rectangle Kite BLM 4 Quadrilaterals Chart 127
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