A square with an extended side. What’s the angle α?
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Ice cube II

A square with an extended side. What’s the angle α?
Two triangles and an extended side. What’s blue : orange?
A circle with two tangents. What’s red : blue in terms of α?
Two circles are tangent to two perpendicular lines and have their centres connected. Prove that the green triangle is right isosceles.
Three squares and three line segments. What’s the angle α?
An ellipse, two circles centred in its focal points, a chord and a tangent. What is the angle α?
A triangle with a cevian. What’s α?
A triangle with two angular bisectors. What’s the proportion blue : red?
A quarter circle and a square. What’s the angle α?
Two squares and three line segments. What’s the angle α?