Identifying two-dimensional shapes (Term 2)

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.

0	A point has no dimensions.
1	Moving the point to one direction, we get a line.  A line is one dimensional.
2	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”
3	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.

Plane Shapes

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.

Oval	Triangle	Square	Pentagon
Circle	Octagon	Diamond	Hexagon

1. 5 sides and 5 angles.
2. One round curved edge.
3. 4 equal sides and 4 right angles.
4. 2 pairs of equal angles and 4 equal sides.
5. One-egg shaped curved edge.
6. 8 equal sides.
7. 3 sides and 3 angles.

Square, Oval, Triangle, Octagon, Circle, Diamond, Pentagon.

Task 2:  What am I?

1. I am a 2-D shape with 4 sides and 4 angles.
2. I don’t have any right angles.
3. My opposite angles are the same size.
4. 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.