7th grade geometry standards

[missbaldwin]

So many questions…
1) In 7.G.2, students work with constructing triangles given certain conditions, yet don’t learn the triangle sum theorem until 8th grade. Are they supposed to know it informally in 7th grade?

3) How does 7.G.3 connect to 7.G.2? Are the shapes students are drawing in 7.G.2 three-dimensional? Are they drawing shapes that would be plane sections of prisms and pyramids?

2) How does 7.G.5 connect to the rest of the standards in its cluster? All of the other domains are so well connected, we’re having a hard time making the geometry standards in 7th grade flow together.

2)

[Bill McCallum]

1) The standard says “Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle.” You can notice experimentally that two angles determine the triangle without knowing the angle sum theorem. In fact, noticing this is good preparation for the angle sum theorem, since it makes you suspect that something like it might be true. There’s also no harm if it comes up; it’s just not required until Grade 8.

3) I think you’ve answered your own question here; certainly describing the cross-sections in 7.G.3 would benefit from drawing figures in 7.G.2. I think 7.G.2 is mostly about plane figures.

2) Have you considered connecting it more to the algebra part of the curriculum? It’s a good opportunity to work with equations.

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