Geometry in the News



Geometry in the News

by Kathryn Hindt

Fort Bend Independent School District

|Course: |Title of Unit: |Title of Lesson: |

|Mathematics |Geometry |Geometry in the News |

|Grade Level: | |Time Frame: |

|3rd | |2 90-minute periods |

|Description |

|Students will use the newspaper to locate examples of geometric figures in real life. They will cut out pictures, mount them on |

|paper, and include a definition of the shapes they find. |

|TEKS Objectives |

|3.8 Identify, classify, and describe two- and three-dimensional geometric figures by their attributes; compare two-dimensional |

|figures, three-dimensional figures, or both by their attributes using formal geometry vocabulary |

|3.9A Identify congruent two-dimensional figures |

|3.9C Identify lines of symmetry in two-dimensional geometric figures |

|Teacher to Teacher Notes |

|Preparation: Cut apart geometry vocabulary words and pictures (pp. 7-17), back on colored paper, and laminate. Use masking or |

|magnetic tape to arrange the images and words on wall or board; words on one side of the board and images on the other. Run off |

|geometry term cards (pp. 3-6) on cardstock so that pictures are one side of the paper and the corresponding definitions are on the |

|opposite side. (These cards can also be run on only one side of cardstock to use as a memory or concentration game.) |

|Students will work in partnerships for this activity. |

|**IMPORTANT: Make sure to demonstrate how to unfold and refold newspaper before beginning the activity!! Make clear your |

|expectations for the location and look of the newspapers when you get them back. |

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|Materials |Resources & Technology |

|drawings of geometric shapes and name plates of their | |

|names (pp. 7-17 of lesson) | |

|models of 3 dimensional figures | |

|4.5” x 6” sheets of manila or construction paper. |(digital pix of activity) |

|geometry cards (pp. 3-6 of lesson) | |

|Procedures/Activities |

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|Engage: Draw students’ attention to the board or wall on which geometric figures are posted. Ask if they see any similarities or |

|differences in the figures. Ask if they see ways we could classify the figures according to their attributes. Elicit that some |

|figures are flat and some are space figures. |

|Explain: Introduce the terms 2-dimensional and 3-dimensional. Discuss what students already know about those terms. Explain and |

|show that 2 dimensional figures have only 2 dimensions to measure or 2 measurements, a length and a width. Then explain and show |

|that 3-dimensional figures actually have those 2 measurements plus height. That’s where the 3 comes from in 3-d. Show how the |

|base of the 3-d figure has length and width and “grew up” from there. The 3 “d’s” or 3 dimensions or 3 measurements are length, |

|width, and height. Place the two headings “2-dimensional” and “3-dimensional” on separate sides of the board. Rearrange the |

|geometric figures under the correct heading or select student volunteers to do so. |

|Next, in random order post the names of the geometric figures on the board with masking or magnetic tape. Select student |

|volunteers to take one term and match it to the corresponding geometric figure on the board. Have them place the term underneath |

|the figure. Continue until all figures have been named and discussed. Review terminology such as edges, faces, vertices, base, |

|length, width, height, sides, angles, symmetry, and congruence along the way. Pass around models of 3 dimensional figures when |

|appropriate so students can touch the edges, faces, vertices, etc. |

|Explore: Assign student partnerships one card at a time (from pp. 4-7) and tell them to search through the newspaper to find |

|pictures of each shape. Instruct them to glue the picture on a sheet of 4.5 x 6 (or other) manila or construction paper, write the|

|word, and give a definition of the word (See link to digital photos for examples to show class). As student pairs complete a card,|

|hand them another one until each pair has completed at least 3. Some terms will be duplicated. Display the work on a wall. |

|Sum it up: What is one way to classify geometric figures? (2-d and 3-d) |

|What does the d stand for? (dimension) |

|What does dimension mean? (measurement) |

|What are the 2 d’s in 2-d? (length and width) in 3-d? (add height) |

|Other questions such as “What is the name for a six-sided figure?” and “How many faces does a cube have?” could be reviewed at this|

|time. |

|Extend: Assign students to look for shapes on their way home, running errands with their parents, or in any other of their after |

|school activities. Have them keep a log or take pictures if they can of their sightings and discuss their findings as a group on a|

|designated day. |

click here to see photos of children using the newspaper for this activity:



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|triangle |hexagon |

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|rectangle |octagon |

| |[pic] |

| |circle |

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|square | |

| |[pic] |

| |triangular prism |

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|pentagon | |

|A polygon with 6 sides |A polygon with 3 sides |

|A polygon with 8 sides |A polygon with 4 sides. Opposite sides are congruent and all 4 |

| |angles are congruent. |

|A plane figure with no sides |A polygon with 4 sides. All the sides and angles are congruent. |

|A 3-dimensional figure with: |A polygon with 5 sides |

|5 faces | |

|6 vertices | |

|9 edges | |

|[pic] |[pic] |

|rectangular prism |cone |

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| |[pic] |

| |sphere |

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|cube | |

|[pic] |[pic] |

|square pyramid | |

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| |congruent |

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|cylinder |Line of symmetry |

|A 3 dimensional figure with: |A 3 dimensional figure with: |

|1 flat circular face |6 rectangular faces |

|A curved surface |8 vertices |

| |12 edges |

|A 3 dimensional figure with: |A 3 dimensional figure with: |

|No faces |6 square faces |

|A curved surface |8 vertices |

| |12 edges |

|Same shape and same size |A pyramid with a square base &: |

| |5 faces |

| |5 vertices |

| |8 edges |

|The line at which a shape can be folded so that its two halves |A 3 dimensional figure with: |

|match exactly |2 flat circular faces |

| |A curved surface |

triangles squares

rectangles hexagon

triangular prism cone

rectangular prism cube

octagon cylinder

square pyramid sphere

pentagon circle

[pic][pic][pic][pic][pic]

[pic]

[pic]

[pic]

[pic]

[pic]

2 dimensional

3 dimensional

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