Describe, model, draw & classify shapes; Investigate & predict the results of combining, subdividing & changing shapes; Develop spatial sense; Relate geometric ideas to number & measurement ideas; Recognize and appreciate geometry in their world.
Geometry is the mathematics of the properties and relationships of points, lines, angles, surfaces, and solids. In geometry, a plane is a 2-dimensional surface that is perfectly flat and infinitely large. Plane figures are named according to the number, size, and position of their sides and angles. For example, a polygon is a closed figure whose sides are all line segments.
When we say solid figure, we don’t mean solid in the usual sense; we mean the figure is not flat, it’s three- dimensional. face base edge vertex Solid figures include prisms, pyramids, cylinders, cones and spheres. There are several different types of prisms and pyramids, and they are named for their bases.
Make a Tangram Square Use all seven pieces of the Tangram to make a square with no gaps or overlaps. Once you have completed your square, cover it up so that the people around you may continue to “enjoy” the challenge.
Grandfather Tang’s Story make Tangram animals. Composing and decomposing with Tangrams – share Tangram Polygon Challenge
If students discuss kinds of sides, talk about “square angles” or corners and use color tiles to check for them. Have students make Example/Non-example sheets to check for understanding. Eventually name shapes, use “Shape Sorting Mat” to help with this. Have students make Example/Non- example sheets to check for understanding. If students discuss parallel sides, use dowel rods to check for them. Use parallel side sort to reinforce this concept. Have students make Example/Non- example sheets to check for understanding.
1. A square is not a rectangle. We teach primary students that there are 4 basic shapes—circles, triangles, rectangles and squares. And, in math, we have no diamond! It’s either a square or a rhombus.