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Using a pegboard would be helpful, or if you don't have one, try using squared paper or this interactive geoboard.
What are the properties of a right-angled triangle?
Which peg have you tried to move?
Can you make the shape by moving a different peg instead?
Are there any other ways to do it?
Transformations on a Pegboard
Age 7 to 11
Challenge Level 
Using a pegboard would be helpful, or if you don't have one, try using squared paper or this interactive geoboard.
What are the properties of a right-angled triangle?
Which peg have you tried to move?
Can you make the shape by moving a different peg instead?
Are there any other ways to do it?
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