Two large congruent rectangles share a vertex and contain two coloured rectangles. What is red : blue?
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Domino day II
Month: February 2024
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Video: Peeping out II
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Seeing double II
A right triangle is divided in two triangles by an altitude. The three incircles are shown with three tangency points. Prove that the two red line segments are congruent.
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Sunrise over green mountain
An acute triangle mountain ABC has altitudes BE and CF. The dotted tangent lines to the sunny circumcircle (AEF) at E and F intersect at a point M. Show that M is on the mountain’s base BC.