## Reflection: Checks for Understanding Finding the surface area of triangular prisms using a net - Section 2: Problem Solving

The problem solving section looks a bit different when the altitudes shown in red are printed as black lines.  Consequently, they had some difficulty distinguishing between an edge and an altitude line. It can already be difficult for the inexperienced to know what edge a number is indicating.  The no-color issue compounded problems.

Look at problem 2 as an example.  Some students were confused by the 2.41 on the base altitude.  They saw that the edge labeled 9 inches  and thought that corresponding side was mislabeled.  I stopped long enough to make sure everyone was clear on what the various numbers were measuring.

Matching Measures to Edges and Altitudes
Checks for Understanding: Matching Measures to Edges and Altitudes

# Finding the surface area of triangular prisms using a net

Unit 6: Geometry
Lesson 18 of 37

## Big Idea: Students use nets to visualize dimensions of bases and lateral faces of a triangular prism.

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50 minutes

### Grant Harris

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