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
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A point has no dimensions.
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1
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Moving the point to one direction, we get a line. A line is one dimensional.
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2
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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”
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3
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Moving the point in another completely different direction, we have three dimensional.
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We are learning to identify and understand the features of two-dimensional shapes
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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
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Triangle
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Square
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Pentagon
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Circle
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Octagon
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Diamond
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Hexagon
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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.
