To begin the class, ask students the following questions:
- How can you classify triangles according to their angles? [right, acute, obtuse]
- How can you classify triangles according to their sides? [equilateral, isosceles, scalene]
- What do you know about the Bermuda Triangle?
1. After the introduction, allow the students to watch the video. Use the handout? What you know about the Bermuda Triangle?
2. You can assign groups for this activity to allow the students to turn and talk and then answer questions. Make sure students record answers on the worksheet.
1. After a brief discussion, distribute the Bermuda Triangle Sides and Angles activity sheet to all students. Answer any questions that students have regarding the activity.
2. Once all questions have been answered and students are ready, allow them to work for 3-5 minutes individually to measure and classify angles. In addition, students need to measure the length of the sides. (You will not need much time for this. During the discussion about types of triangles, prompt students to think about how sides and angles are related.
3. For the next 3‑5 minutes, allow students to share their thoughts with a partner. During these discussions, students will often realize any errors that they made.