Reduce, Reuse and Make 3D Objects

Over the last few weeks students have been studying about 2D and 3D objects. We started this current Maths unit looking at points. We discovered that we can label points with a letter from the alphabet and then we can connect these points using a straight edge to form line segments. Line segments can be parallel (meaning they never touch one another) or not parallel.

We then learned that if we connect line segments to create a closed figure we can create polygons! There are many kinds of polygons – some of our favorites are the hexagon, octagon and the always popular trapezoid and parallelogram. What is your favorite 2D object?

We have been using Innovations Learning’s Shape Facts application to help us learn more about 2D shapes and lines of symmetry:

When you can fold a shape in half, and one half exactly covers the other half, we can say that the shape is symmetrical. And the fold line is the axis of symmetry.

Some shapes have lots of different axes of symmetry, some have only one, and lots of shapes are not symmetrical at all.

After exploring 2D objects, we began focusing our attention on 3D objects. We learned that 3D objects have faces. Faces are flat surfaces, like the front or top of a cereal box. 3D objects also have edges that are the lines along which two faces come together. 3D objects also have what are called vertex or vertices which are “points” on a shape or corners where several faces (and edges) come together.

After learning about 2D and 3D shapes/objects, we decided to put our knowledge into action. We used our recycled paper to create 3D rectangular pyramids and cubes. We had a lot of fun making 2D shapes and then transforming them into really cool 3D shapes!

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2 Responses to Reduce, Reuse and Make 3D Objects

  1. Mr. Salsich says:

    Hello IST Grade 2,

    I love your 3D objects made from reused paper! It looks like you had a lot of fun making them.

    I teach 3rd grade in Connecticut, USA and we have been learning about shapes also. My students made 3D objects out of toothpicks and mini-marshmallows. Next week we will have a contest to see which team can build the highest structure. I’ll put a post about it on our blog.

    In April we are going to use what we have learned about shapes, symmetry, and measurement to make kites out of recycled materials. Maybe you guys would like to join our project about kites?

    Either way, I am very glad I found your great blog. Keep up the fantastic work.

    My favorite 2D object is a hexagon.

    -Mr. Salsich

  2. Hi its great that you guy are learning about 3D and 2D shapes.

    Elecia
    Room 8, Melville Intermediate
    Hamilton Waikato, NewZealand

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