Constructing Triangles
Free to teach as-is — the teacher guide, student handout, and slides are included.
Free — we'll email you an access link. Google Docs format.
Objective
I can accurately create triangles using a ruler and protractor when provided with specific angle and side length measurements.
Part 1 of 3
Warm-up video
Unknown Channel · 5:00
We don't generate video — this one is by Unknown Channel on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 3
Practice
7 questions
Explain in your own words why it's not always possible to draw a triangle when you know the lengths of all three sides.
The video showed that you can't make a triangle with sides of length 2, 2, and 5. What was the problem?
Part 3 of 3
Exit ticket
Quick comprehension check
“Can a triangle be constructed with sides of length 4 cm, 5 cm, and 8 cm? Explain why or why not. Can a triangle be constructed with sides of length 2 inches, 3 inches, and 6 inches? Explain why or why not. Can a triangle be constructed with sides of length 7 mm, 7 mm, and 10 mm? Explain why or why not.”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
Printable worksheet
Slides
Ready to present
We'll ask for your email to send your access link — nothing else.
Teaching a group at a different level?
Where are your students right now? We'll rebuild this lesson to match — including the teacher guide, student handout, and slides, saved to your Google Drive.
Adapt This Lesson
