Classifying 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 classify triangles by their sides and angles.
Part 1 of 4
Warm-up video
mathantics · 7:40Vetted channel
We don't generate video — this one is by mathantics 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 4
Key concepts
3 concepts
- 1
Triangles can be classified by their sides and by their angles.
- 2
An equilateral triangle has 3 equal sides, an isosceles triangle has 2 equal sides, and a scalene triangle has no equal sides.
- 3
The three angles of any triangle will always add up to 180 degrees.
Part 3 of 4
Practice
9 questions
What are the two main ways to classify triangles, as discussed in the video?
A triangle has angles measuring 90°, 60°, and 30°. What type of triangle is it?
Part 4 of 4
Exit ticket
Quick comprehension check
“Classify the following triangle by its sides and angles: A triangle has sides measuring 5cm, 5cm, and 8cm, and one angle measures 110°.”
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
