An equilateral triangle inscribed in a rectangle. What is its area X in terms of triangle areas A and B?
Tag: triangle
Under the volcano
A square containing a right isosceles and an equilateral triangle. What’s the angle α?
The Pisa experiment
Four squares and an altitude to the top vertex form a right yellow traingle. What is the proportion yellow : green?
The queen
A cyclic quadrilateral with extended sides and two tangents forming an angle γ. What is γ in terms of α and β?
Two hemispheres
A triangle with its circumscribed circle and a smaller intersecting circle. The two intersection points and the circumcentre are shown. What’s the proportion red : green?
Boxed in
A square with an inscribed right triangle. What fraction is yellow?
Napoleon strikes again
Three equilateral triangles and two line segments. Prove that the three red points are collinear.
An equitable portion
A square, its diagonals and a right triangle. What fraction is green?
The leftward lean
Two triangles form a quadrilateral. What’s the total orange area?
Eternal snow
A triangle with two angle bisectors. What fraction of its area is green?