Three tangent circles and a common tangent. The three tangency points are shown. What is α + β?
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The double flag
Tag: angle
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The door stop
A triangle with a cevian. What is α?
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Easing it down
Three squares share three vertices. What’s the angle α?
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The pendulum
Two equilateral triangles share a side midpoint. What is the angle α?
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Five to twelve
A square and a rectangle share two vertices. If the square has twice the area of the rectangle, what’s the angle α?
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The grazing shot
A parabola and its directrix in red. Two tangents intersect at a point on the directrix. What’s the angle α?
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Worlds colliding
Two intersecting circles and a circle passing through both their centres and their intersection points. What’s the angle α?
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The parallax effect
Two intersecting circles with a triangle that passes through their centres and an intersection point. What’s the angle α?
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Under the volcano
A square containing a right isosceles and an equilateral triangle. What’s the angle α?
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The queen
A cyclic quadrilateral with extended sides and two tangents forming an angle γ. What is γ in terms of α and β?