A semicircle with its centre. What is green : red in terms of the angles α and β?
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Through the roof
Month: December 2023
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Airbag ball
A triangle with its excircles. The tangent radii are extended. Prove that the red line segments are concurrent and congruent.
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Folding a pentagon
One side of a regular pentagon is folded back and forth as shown. Are the six red line segments congruent?
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Snow man scarf
Show that blue = red if and only if purple = orange.
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Lemon slice II
A semicircle inscribed in a quarter circle. What fraction is yellow?
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Cuckoo in the nest
Two tangent semicircles inscribed in another semicircle. What is the total area?