Identifying two dimensional shapes
In Geometry we can have different dimensions. The number of dimensions is how many values are needed to locate points on a shape.
A point has no dimensions.
Moving the point to one direction, we get a line. A line is one dimensional.
Moving the point in a different direction, we get a plane. There are two values to find a point on that plane. We have two dimensions or “2D”
Moving the point in another completely different direction, we have three dimensional.
We are learning to identify and understand the features of two-dimensional shapes
Two-dimensional shape is a shape that only has two dimensions (such as width and height). They are also made with straight lines and corners or curved lines.
Polygons are 2-dimensional (2-D) shapes with straight sides. To be a regular polygon all the sides and angles must be the same. All shapes in the box below are polygons except circle and oval.
A circle is a shape that is made up of one continuous curved line. This shape is two-dimensional, which means it's flat. A triangle is a polygon with 3 sides.
Task 1: Practicing 2-dimensional shapes. Read the shape’s description and choose the name that matches the plane shapes above. For example: 6 sides and 6 angles is a Hexagon.
- 5 sides and 5 angles.
- One round curved edge.
- 4 equal sides and 4 right angles.
- 2 pairs of equal angles and 4 equal sides.
- One-egg shaped curved edge.
- 8 equal sides.
- 3 sides and 3 angles.
Square, Oval, Triangle, Octagon, Circle, Diamond, Pentagon.
Task 2: What am I?
- I am a 2-D shape with 4 sides and 4 angles.
- I don’t have any right angles.
- My opposite angles are the same size.
- There is a picture of me on the first page.
I am a …..
Draw a picture of the shape into your maths book. Screenshot and paste here.