Two regular pentagons share a vertex. What is the proportion red : green?
Tag: length
Mother and child
Two circles, two radii and three chords. What is the length of radius x in terms of a, b and c?
A light packing
A triangle containing two congruent squares. Each square has 1/3 the perimeter and 1/6 the area of the triangle. What’s the triangle side length proportion a : b : c?
The glass splinter
A triangle of which two sides and one angle are given. What’s the angle α?
The Christmas star
Two congruent concentric equilateral triangles. Prove that the gold fraction is red/blue.
Pushing the boundary
Two equilateral triangles are placed side by side. What’s the proportion green : red?
A deep connection
Two squares inside a circle. What is the circle area in terms of length a?
Square one
Three squares share a vertex. Two line segments pass through side midpoints. Prove that a : b = c : d.
The japanese progression
An isosceles trapezium with its inscribed circle. If the lengths are such that b-a=c-b=d-c, what is a : b : c : d?
The bear trap
A semicircle with two tangents and a perpendicular line segment from a tangency point. What is the blue area in terms of lengths a and b?