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Properties of 2D ShapesTake a look at some of the language used to describe the properties
of 2-dimensional (2D) shapes below:
curved longer
v
sides
straight shorter 2-dimensional equal
corner symmetry length
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Properties of 2D ShapesTake a look at some of the language used to describe the properties
of 2-dimensional (2D) shapes below:
obtuse angle right angle acute angle
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circle
1 curved side
0 vertices
almost infinite lines of symmetry
Sum of interior angle is 360°
How many curved sides?
How many vertices?
How many lines of symmetry?
What do all the interior angles
measure?
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triangle
3 straight sides
3 vertices
up to 3 lines of symmetry
3 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
3 acute anglesWhat type of angles can you see in this
shape?
Challenge: What is the sum of all interior angles in a triangle?
180°
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square4 straight sides
4 equal length sides
4 vertices
4 lines of symmetry
4 interior angles
4 right angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?
What does each interior angle
measure?
each interior angle is 90°
90° 90°
90° 90°
Challenge: What is the sum of all interior angles in a quadrilateral?
360°
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trapezium
4 straight sides2 equal length sides
4 vertices
1 line of symmetry
4 interior angles
2 acute angles2 obtuse angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?
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rectangle4 straight sides
2 long sides2 short sides
4 vertices
2 lines of symmetry
4 interior angles
4 right angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?
What does each interior angle
measure?
each interior angle is 90°
90° 90°
90° 90°
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rhombus
4 straight sides4 equal length sides
4 vertices
2 lines of symmetry
4 interior angles
2 acute angles2 obtuse angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?
How many pairs of interior angles?
2 pairs of interior angles
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regular pentagon
5 straight sides
5 vertices
up to 5 lines of symmetry
5 interior angles
5 obtuse angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?
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regular hexagon
6 straight sides
6 vertices
up to 6 lines of symmetry
6 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?6 obtuse angles
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regular heptagon
7 straight sides
7 vertices
up to 7 lines of symmetry
7 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?7 obtuse angles
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regular octagon
8 straight sides
8 vertices
up to 8 lines of symmetry
8 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?8 obtuse angles
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regular nonagon
9 straight sides
9 vertices
up to 9 lines of symmetry
9 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?9 obtuse angles
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regular decagon
10 straight sides
10 vertices
up to 10 lines of symmetry
10 interior angles
How many straight sides?
How many vertices?
How many lines of symmetry?
How many interior angles?
What type of angles can you see in this
shape?10 obtuse angles
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