Discuss and compare polygons | Maths | Quizalize & Oak National Academy

Starter quiz

Match the image of the polygon to its name.

a

⇔

pentagon ✓

b

⇔

octagon ✓

c

⇔

quadrilateral ✓

d

⇔

triangle ✓
Match each polygon with its properties.

triangle

⇔

3 sides and 3 vertices ✓

rectangle

⇔

4 sides and 4 vertices ✓

pentagon

⇔

5 sides and 5 vertices ✓

hexagon

⇔

6 sides and 6 vertices ✓

octagon

⇔

8 sides and 8 vertices ✓
True or false. This image shows a line of symmetry.

True
False ✓
If a shape is symmetrical, one half of the shape is a ______ of the other side.

symmetrical

reflection ✓

line of symmetry
Which of these shapes is symmetrical?
Which image shows the correct reflection?

Exit quiz

Compare the shapes. Which statements are true?

a) and b) are both rectangles ✓

a) is shorter than b)

b) is larger than a)

a) is larger than b) ✓
Compare these shapes. Which statements are true?

a) and b) are both triangles. ✓

Both shapes are the same size.

Shape a) is wider than shape b). ✓

Shape b) is 'taller' than shape a). ✓
Order the shapes from smallest to largest.

1

⇔

b

2

⇔

c

3

⇔

a
True or false. The vertices of this polygon are all the same.

True ✓
False
What is the same about both of these shapes?

They are both polygons. ✓

They are both quadrilaterals.

They both have vertices that look like square corners.

They both have a pointy vertex. ✓
Match the number with the description of the vertex.

1

⇔

a square-corner vertex ✓

2

⇔

a sharp, pointy vertex ✓

3

⇔

wide vertex ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

Polygons can be compared by looking at their properties such as number of sides or vertices.
The space inside polygons can be described using informal language such as long, thin, short, wide, larger and smaller.
The vertices of a polygon can be described and compared using informal language such as sharp, pointy, wide and large.

Common misconception

Children may think that a shape must be larger because it is wider or longer than another shape, or that the smallest shape should always be the shortest or narrowest.

Encourage children to focus on the amount of space that a shape takes up. Explore cutting up shapes and manipulating them so that they have the same width or length to help children see which is the largest or smallest shape overall.

Keywords

Larger - A larger shape is one that takes up more space than another.
Smaller - A smaller shape is one that takes up less space than another.
Compare - You compare to find out what is the same and what is different.