Friday, January 9, 2009

Building Co-op - Building 3D Designs

Thought I would post about what we did in our building co-op before Christmas. The kids were split into three groups and rotated through three different activities. I'll include what we did as well as changes and or additions for increased difficulty.

Activity 1:

Kids were shown a 3-dimensional box and how it unfolded. The 2-D result is called a net. We talked about the shape (a square based pyramid in the case), the shape of the faces and how the net is drawn. They then got to choose from 3 or 4 nets and were able to construct their own.

Advanced activities:
- give the child a prism or pyramid, have them take measurements and draw a net and construct the 3D shape
- calculate volume and surface area of your constructed boxes
- design a product/package with the constructed box

Activity 2:

We had a variety of cards with 3-D images on them. The images showed structures which had been constructed with cubes. Students had to reproduced the designs.

Advanced activities:
- this is a great activity for teaching orthographic or even isometric drawings
- take the constructed 3D shape and draw the top, front and right side view
- draw the isometric view
- or, give the kids the three views (or more if necessary) and have them construct the shape
- calculate the surface area of the constructed object

Activity 3:

I think the kids had the most fun with this activity and we had the best discussions going. I started the discussion by showing them a rectangular based pyramid. We talked about the shape of the bottom and tops and then looked at the shapes of the sides. We discussed the number of sides. We talked about faces, vertices, and edges. Then I asked them how we would change it into a pyramid. After we changed it they could try making prisms and pyramids with different shaped bases. This works best with plastercine - not play-doh.

Advanced activities:
- give kids a chart with the number of faces, vertices, and edges and have them determine the type of pyramid or prism
- calculate angles or type of angles

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