## Tuesday, 23 May 2017

### Two dimensional shapes

Identifying two dimensional shapes

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.