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Student Instructions
Diagonals ✳️of 2D Shapes🟧🔶
Start with the 
on pages 1-3
https://www.youtube.com/watch?v=XO6t7Cqa_p4
https://www.mathsisfun.com/geometry/polygons-diagonals.html
Watch, read and interact with the information on these sites.
When you are ready -
1. Read each page and answer the questions carefully.
2. Show your reasoning on problems that ask you to show work.
3. For drawing tasks, use a 
and :3dot: shape tools and label vertices.
4. Complete the matching and sorting activities.
5. Finish the open-ended responses to show your thinking.
When completed aii pages 
Teacher Notes (not visible to students)
🤖 Created with the assistance of Seesaw AI This activity checks students' understanding of what diagonals are and their ability to count and draw diagonals using the formula D = n(n - 3)/2. Use the included video as a short introduction (5–8 minutes) before students begin. Prepare paper, pencils, rulers, and printed polygons for the drawing tasks. For partner work, students can compare drawn diagonals and explain counting methods to each other. High-quality answers for the Paragraph open response should: (1) correctly apply the diagonal formula or show a clear counting method, (2) include correct drawings with labeled vertices and all diagonals shown, and (3) explain reasoning in complete sentences. High-quality multimedia responses (drawAndRecord or video) should clearly show the polygon, the drawn diagonals, and a spoken or written explanation of how the student counted them. Teachers can grade open-ended items as correct/incorrect using these criteria.
