This post is to keep you aware of what we are doing in math this unit. Geometry is an easy unit to include in daily life and while there are a lot of big words in this unit, if they are reviewed often, the students can do very well.
Here are the 2D shapes/polygons that have been introduced: triangle, rectangle, square, rhombus, parallelogram, trapezoid, pentagon, hexagon, heptagon, octagon.- We name shapes based on their number of sides and their other qualities.
Here are some of the terms and their definitions that the students will need to use to describe 2D shapes.
Congruent– When two shapes are compared, two shapes that have the same size and shape.
Parallel Lines– Two opposite lines in a polygon (closed shape) that will never cross. (We use the analogy of train tracks running side by side forever)
Quadrilateral– any 4 sided shape
Equilateral– all sides of the polygon are equal
Regular Shape– a polygon with all sides and angles equal
Irregular Shape– a polygon that does not have all sides and angles equal
Vertex (plural vertices)– where two lines of a polygon meet. Students have to say how many there are in a polygon.
Angles– Students need to be able to identify a 90 degree right angle (such as in a rectangle) and angles that are smaller and larger than a right angle within polygons.
Lines of Symmetry– A line that divides a polygon into two congruent parts. Students need to be able to draw lines on a shape to show when there is a mirror image from one side of the line to the other and determine how many lines of symmetry there are in a polygon. They also have to complete shapes on a grid when only given one half of the shape to show a symmetrical shape.
After all of this is taught, students will then need to be able to describe and compare two shapes (state the similarities and differences) using these concepts.
I hope this is helpful! Today we completed parallel lines, so an easy way to review this with your child would be to find shapes around the house and determine if they have parallel lines.