## Reflection: Developing a Conceptual Understanding Equations in Geometry - Section 1: Opening Activity - Mixing the Bubble Solution

Because we had already mixed our bubble solution prior to this day, I developed a geometry specific bellringer to both prove and review an important theorem students would need to apply in order to solve the problems.  I used the three triangles provided in the resources and passed them out to student partners.  Students cut the triangles out and then I asked them to answer one question:  What is the value of x?  Some students went for the fact that the angles of any triangle sum to 180 degrees and I asked them to prove it to me by ripping the angles off the triangle.  I told the students to literally add the angles together like they did as expressions on their paper.  We noticed that any of the three triangles made a straight line (straight angle) or semi-circle as some noticed more easily.  I took examples from all three triangles and put them under the document camera to prove the semi-circle or straight angle from any triangle.

Developing a Conceptual Understanding: Design - Developing a Conceptual Understanding

# Equations in Geometry

Unit 3: Solving Linear Equations in One Variable
Lesson 20 of 29

## Big Idea: Give context to multi-step equations while also reviewing basic geometry properties of two dimensional figures - it's a two-fer!

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1 teacher likes this lesson
Standards:
Subject(s):
Math, solving equations, Algebra, Geometry, 8th grade math, aglebra, master teacher, application of equations
50 minutes

### Christa Lemily

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