Categories
Beginner

The flying saucer

A quarter circle with four chords. What is the proportion purple : gold?

Categories
Beginner

Missing pieces

A rectangle is divided in six similar triangles. What is the proportion green : yellow : red : blue?

Categories
Beginner

The root cause

A square and an equilateral triangle are divided in several polygons. What is the proportion yellow : blue?

Categories
Beginner

The holy number

An equilateral triangle and several line segments. What fraction is purple?

Categories
Beginner

The Transamerica Pyramid

Two squares inscribed in a triangle. What fraction of its area is coloured?

Categories
Advanced

The odd couple

A semicircle with two inscribed triangles The tangency points of the incircle of the bigger triangle are shown. What is the triangle area proportion orange : blue?

Categories
Beginner

Trinity

Three squares are placed as shown. What fraction of the total area is green?

Categories
Intermediate

The turning point

Two isosceles triangles share a vertex. What is the maximum of their area proportion red/green?

Categories
Intermediate

The obstructed view

A rectangle and two squares of side length a and b respectively. What is the red area in terms of a and b?

Categories
Intermediate

Mickey Mouse

Three regular pentagons and two extended sides. What fraction of the total area is red?