Triangle and Quadrilateral Angles
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Objective
I can determine the angle sums of triangles and quadrilaterals.
Part 1 of 4
Warm-up video
Miacademy & MiaPrep Learning Channel · 8:39Vetted channel
We don't generate video — this one is by Miacademy & MiaPrep Learning 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 4
Key concepts
3 concepts
- 1
A triangle is a shape with three sides and three angles, and the sum of its interior angles is always 180 degrees.
- 2
Triangles can be classified by their angles (right, acute, obtuse) or by their sides (equilateral, scalene, isosceles).
- 3
The sum of the interior angles of a quadrilateral is 360 degrees, which can be shown by dividing it into two triangles.
Part 3 of 4
Practice
12 questions
What is the sum of the interior angles of any triangle?
If a triangle has angles measuring 60 degrees and 80 degrees, what is the measure of the third angle?
Part 4 of 4
Exit ticket
Quick comprehension check
“One angle of a triangle measures 30°. Another angle measures 80°. What is the measure of the third angle?”
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
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