A square, its diagonals and a right triangle. What fraction is green?
Categories
An equitable portion
Category: Intermediate
Categories
The wedge
A trapezium with its inscribed circle. Two tangency points are shown. What’s red / blue – yellow / green?
Categories
The fish trap
Two intersecting circles and two common tangents. Prove that α = β.
Categories
Eternal snow
A triangle with two angle bisectors. What fraction of its area is green?
Categories
Lines in the sand
Two intersecting circles and four chords. Prove that the red chords are parallel.
Categories
The same channel
Two circles and two common tangents. Prove that the blue triangle is isosceles.
Categories
Le Petit Nicolas
Two parallel squares with four line segments connecting opposing vertices. Prove that they pass through a single point.
Categories
Emerging from water
Two squares and an extended side. What’s red : green : pink?
Categories
The secret document
One corner of a rectangular piece of paper is folded back and forth to the opposite side. What is the proportion red : blue?
Categories
An irregular tiling
A triangle divided by three line segments. What fraction is blue?