Lets Sort Shapes and Objects Slide1 · 2020-05-29 · Lets Sort Shapes and Objects Slide1 Created...
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www.planbee.com Next Let's Sort Shapes and Objects Today I will be... Identifying and describing 2-D shapes
Transcript of Lets Sort Shapes and Objects Slide1 · 2020-05-29 · Lets Sort Shapes and Objects Slide1 Created...
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Let's Sort Shapes and Objects
Today I will be... Identifying and describing 2-D shapes
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Mental Oral Starter
How many squares can you see altogether?
Share your ideas with a partner.
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Mental Oral Starter
There are seven squares
altogether!
1
2 3
4
5
6
7
Did you spot
them all?
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What is a polygon?
Think, pair, then share your ideas.
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A polygon is a 2-D shape made from straight lines. The shape is closed (all lines are joined up).
Which of these 2-D shapes are polygons?
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Polygons Not polygons
Can you explain why these three shapes are not polygons?
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How many of these polygons can you name?
12
33
11
2
2
For each correct answer, you will score the number in the shape! There is a maximum score of 15.
Check the answers on the next slide...
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1
2 33
11
2
2
Triangle Square Rectangle Pentagon
Hexagon Octagon Kite Rhombus
What was your score?
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How would you describe this shape? What words
would you use?
PentagonThink, pair, then share your ideas.
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This shape has five sides and five corners.
a side
a corner
This is a regular pentagon. This means that all of the sides are the same length,
and all of the corners are the same size.
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What do you think an irregular
pentagon could look like?
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The sides are not all the same length, and the corners are not all the same size.
These shapes are all irregular pentagons.
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How would you describe these two shapes?
Try to use the following words: sides, corners,
regular, irregular
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It has six sides that are all the same length, and six corners that are all the
same size.
This is a regular hexagon. This is an irregular hexagon.
It has six sides that are not all the same length, and six corners that are not all
the same size.
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Choose one of these shapes and describe it to a partner.
Can your partner identify which shape it is from your description?
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I have a 2-D shape. It has four sides and
four corners.
What could it be?
Think, pair, then share your ideas.
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All of these shapes have four sides and four corners!
How many of these shapes can you name?
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Any 2-D shape that has four sides belongs to a special group of shapes called quadrilaterals.
Square
Parallelogram
Kite
Rhombus
Rectangle
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How would you describe each quadrilateral so that they could be correctly identified?
Square
Parallelogram
Kite
Rhombus
Rectangle
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As all quadrilaterals have four sides and four corners, we need to add more to our descriptions so that we
can identify each one !
Square
This 2-D shape has four sides that are all the same length, and four corners
that are all the same size.
Do you agree with this description?
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This 2-D shape has four corners that are all the same size. There are four sides. The opposite sides are the same length. One pair of sides is
longer than the other pair.
What is the difference between a square and a rectangle?
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Rhombus
This 2-D shape has four sides that are all the same length. The opposite corners are the
same size.
I think a rhombus looks like a squashed square!
Do you agree with this description?
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Parallelogram
This 2-D shape has two pairs of opposite sides that are the same length. It also has two pairs of opposite corners
that are the same size.
I think a parallelogram looks like a squashed rectangle!
Can you see the pairs of opposite corners?
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Back NextKite
This 2-D shape has one pair of opposite corners that are the same size. It has one pair of short sides that are joined
with each other and the same length. It has one pair of long sides that are joined with each other and the same length.
Can you see the pair of short sides
and the pair of long sides?
This one's the trickiest...
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Polygon Quadrilateral
Can you remember what these two words mean?
Think, pair, then share your ideas.
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Polygon Quadrilateral
A polygon is a 2-D shape with straight sides.
A quadrilateral is a 2-D shape with four
sides and four corners.
Can a shape be both a polygon and a quadrilateral?
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The answer is yes!
All quadrilaterals are polygons – they are all 2-D shapes with straight
sides.
But not all polygons are quadrilaterals – some have less than or more
than four sides.
SquareRhombus Rectangle
HexagonPentagonTriangle
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Now it's time for you to identify and
describe some 2-D shapes yourselves!
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Plenary
This is a triangle.
Explain your reasoning to a partner.
Agree or disagree?
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Plenary
The three sides would need to be joined to make this a triangle.
Disagree!
Does this match your answer?
