Five equidistant parallel line segments. What’s the proportion green : red?
The double helix

Five equidistant parallel line segments. What’s the proportion green : red?
Two squares share a vertex. What’s the proportion x : y in terms of side lengths a and b?
An equilateral triangle with given distances between its vertices and an exterior point. What’s its side length x?
A square containing two overlapping equilateral triangles. What’s the length proportion a : b?
Five circles, of which the green circles are congruent and so are the blue ones. If rblue : rgreen= 6, what’s rred : rgreen?
A triangle with an inscribed triangle. What fraction of the former does the latter cover in terms of lengths a, b, c, d, e and f?
Two congruent triangles are placed as shown. A line segment passes through the centroid of the yellow triangle. What’s the proportion a : b?
Two tangent circles and two tangent line segments meeting in a point on the outer circle. The tangency points are connected by a line segment of length x. What’s x in terms of a and b?
A square divided by three line segments. The red and blue areas are equal. What’s the length proportion a : b?
Four parallel line segments, one of which is divided in three parts. What is the proportion blue : red : green?