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Intermediate

The double flag

Three tangent circles and a common tangent. The three tangency points are shown. What is α + β?

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Solution

α + β is 90°.

Solution by ʙᴇɴᴇ.

One might refer to The lunar twins to check that C is indeed the centre of the large circle.

Poem

The double flag
Blue
And yellow
For freedom
Blue like the sky
Yellow like the sun

Bella

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