A square with an extended side. What’s the angle α?
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Ice cube II
Tag: angle
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Rule of 72
Two triangles and an extended side. What’s blue : orange?
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The hawfinch II
A circle with two tangents. What’s red : blue in terms of α?
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The odd balance
Two circles are tangent to two perpendicular lines and have their centres connected. Prove that the green triangle is right isosceles.
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The stack
Three squares and three line segments. What’s the angle α?
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The lorgnette
An ellipse, two circles centred in its focal points, a chord and a tangent. What is the angle α?
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Count to five
A triangle with a cevian. What’s α?
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The sandal
A triangle with two angular bisectors. What’s the proportion blue : red?
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Sliding down II
A quarter circle and a square. What’s the angle α?
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Meeting halfway
Two squares and three line segments. What’s the angle α?