Categories

## The folded napkin

A square sheet of paper is folded symmetrically from a corner. If the fold length is 4, what is the area of the triangle formed by the other three corners?

Categories

## Twin peaks

A rectangle with three line segments. What is the proportion yellow : red?

Categories

## Pyramidion

A triangle containing a semicircle and an equilateral triangle. What fraction is golden?

Categories

## Triple dice

An equilateral triangle with three congruent squares. What’s the angle α?

Categories

## Paper hat II

Two overlapping congruent right triangles. If |AB|=15 and |BC|=7, what is the total area?

Categories

## En garde

An isosceles triangle with two altitudes dividing each other in segments of length 4 and 5. What is the total triangle area?

Categories

## Distant peaks

Two isosceles triangles and a right angle. What is the proportion green : gold?

Categories

## The Lion King II

A regular hexagon and three squares. What is the proportion yellow : brown?

Categories