Math by Topic Sampler

Lesson Plan for Student Book DIV, Page 18 That means this shape is already in the smallest envelope that describes it. Repeat with squares, parallelograms, trape- zoids, and quadrilaterals with no parallel sides. A BOUT T HIS P AGE Ask a volunteer to describe a quadrilateral and find an example. Repeat with each of the other shape words from problems 1 to 10. Remind students to refer to the quadrilateral diagram to help answer questions 11 and 12. Answer Key: 1. B, D, F, H, I, J, K L, R, U 2. C, E, M, T 3. G 4. A, P 5. B, D, F, H, K, L, U 6. I, R 7. D, F, H, K, U 8. All except Q, S 9. Q, S 10. F, H 11. Yes, it is a rectangle with equal sides. 12. No, all sides are not equal. Puzzle: The top 2 figures are kites. The essential property of kites is that they are symmetrical when folded across 2 of their corners. F OLLOW UP A CTIVITIES Skill Builders 31-4 O BJECTIVE : To review classifying polygons. M ATERIALS : Cutouts of various quadrilaterals. V OCABULARY : quadrilateral, parallelogram, rectangle, square, trapezoid I NTRODUCTORY A CTIVITIES Identifying Polygons Have student volunteers describe each polygon using its necessary but sufficient properties. Quadrilateral – Any polygon with four sides. Parallelogram – A quadrilateral with opposite sides that are equal and parallel. Rectangle – A parallelogram with all right angles. Square – A rectangle with four equal sides. Trapezoid – A quadrilateral with exactly two parallel sides. Draw this diagram on the board and use tape to place the shapes “into” the correct location. (To demonstrate the classification of quadrilater- als, you may also glue 4 envelopes on 1 large envelope as in the diagram. Sort various cutout quadrilaterals into the correct envelope.) For example, pick a rectangle. Is this shape a quadrilateral? (yes) Place the shape in the large envelope. Describe the shape more specifically. Is this shape a parallelogram? (yes) How do you know? (Its opposite sides are equal and parallel.) Put the shape in the parallelogram envelope. Let’s get even more specific. What is a rectangle? (It’s a parallelogram with right angles.) Is this shape a rectangle? (yes) Place the shape in the rectangle envelope. Let’s see if we can get even more specific. What is a square? ( a rectangle with 4 equal sides or a parallelogram with 4 right angles and 4 equal sides) Is this shape a square? (no) Quadrilaterals S R P T 38 L E V E L D g r a d e s 7 – 8 Explicit, Conceptually-Based Instruction: name types of polygons * Not all lessons follow this format Reinforce 3 3 Introduce > Explore 1 1 Page 18 Student Book Visualize 2 Level D Teachers Manual 18