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Animated Triangles

Age 5 to 7
Challenge Level

Luke from St Patrick's School responded to this problem. This is how he described the film:

It uses rotating, sliding and shifting (we can call this "translating"). Along with that the triangles are changing from iscoseles to equilateral to scalene and of course right angled!

Luke watched the first 34 seconds and said:

It only uses equilateral and scalene triangles!

Describing the next part, up to a minute, Luke wrote:

The triangle(s) are rotating continuously.

Thank you, Luke. I wonder whether anyone can add any more detail to Luke's comments?