- Ask the students to make a list of the intersections on paper and how each angle fits the description.
- You could also have the students enlarge the map (or do this ahead of time), and then use a protractor to
measure the angles. - Ask students to share their work in small groups.
III.TechnologyIntegration
- Search maps from different cities.
- You could use the map of the city that you live in.
- You could ask the students to identify a city of their choosing.
- Then complete the same exploration with a protractor on this map.
IV.NotesonAssessment
- Check student maps.
- Collect the student maps and their notes.
- Have the students identified the angle pairs correctly.
- If measurement was completed, is it accurate?
- Provide students with feedback/comments on their work.
Classifying Triangles
I.SectionObjectives
- Define triangles
- Classify triangles as acute, right, obtuse, equiangular
- Classify triangles as scalene, isosceles, or equilateral
II.Cross-curricular-TriangleCreations
- This is a fun way to explore triangles.
- To prepare, you will need an assortment of one or more of the following items: gumdrops, marshmallows,
toothpicks, tinkertoys, kynex - Be sure that the students understand the different types of triangles and have an example of each type.
- Then have them create an example of each of the following triangles using the materials provided.
- The students will have a GREAT time with this. It is very hands- on and since so much work has been done
on the different triangle types, this will make the lesson fun. - Students need to label each type and example and be able to explain how and why it is that type of triangle.
- Allow time for the students to present their creations.
III.TechnologyIntegration-Geometricpaintings
- Use the following website for an investigation in geometric paintings using triangles. This is Figure 01.06.01
- http://www.4.bp.blogspot.com/_wLt09kFTsi4/RdsN0RvBmgI/AAAAAAAAAAk/Oo6kiVl78AE/s400/BlackBeetle.jpg
- Ask the students to work in small groups and identify the different types of triangles in this painting.
- Then have the students create their own painting using the different types of triangles.
- They should create a key and color code to show each type of triangle.
- An alternative to this would be to have the students search and find triangles in other geometric paintings.
- They can then use this one as a springboard for their own design.
Chapter 3. Geometry TE - Enrichment