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Elasticity

Four squares and two triangles. Prove that the two green angles are congruent.

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Solution

Solution by Jan.

Visual solution

Solution without words by David Andriana.

Poem

Elastic things
Gently fit together
One square fits into the other in fusion
Like a stained glass window
Waves that come and go
A masterpiece in creation
With colours and vibrations
Parts that depend of their evolution
And together become a square union

Bella

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