Categories

## Tilted hourglass III

A regular hexagon, a circle through its red centre and two line segments. What’s blue : orange?

Categories

## Flying purple people eater

What is the area of the purple people eater, in terms of the lengths AD and BC?

Categories

## Primary colours

An equilateral triangle inside a rectangle. What is red : yellow : blue?

Categories

## Running man

What is the area of the coloured figure? Can you determine the area without counting the number of squares in each different-coloured shape?

Categories

## The party hat II

An equilateral triangle with a circular arc through its red centre and two vertices. If the yellow area equals the green one, what’s the angle α?

Categories

## The lighthouse

A parallelogram and four equilateral triangles. What is yellow : green?

Categories

## Tip of the veil

A square with two right angles. What fraction is yellow?

Categories

## Three dome home

How does the white area inside the big semicircle compare to the combined white areas of the 3 smaller semicircles below it? Equally coloured semicircles are congruent.

Categories

## The hex division

A regular hexagon with two diagonals and two perpendiculars. What’s red : yellow?

Categories

## The owl of Ceva

A triangle with three concurring cevians. What’s orange : blue?