Categories
Beginner

The green field

A square is divided in two quadrilaterals of given area. What fraction of the square’s perimeter is red?

Categories
Intermediate

The hourglass

A rectangle with two crossing line segments. What’s the minimal shaded fraction?

Categories
Intermediate

The ramp

A right triangle is split in two. What is the maximum yellow fraction?

Categories
Intermediate

The Eye of Horus

A semicircle containing two equilateral triangles containing a circle. What fraction is blue?

Categories
Intermediate

The crane

A triangle with an inscribed square. What fraction is yellow?

Categories
Advanced

The balancing block

A rectangle inside a square. One of its sides is tangent to the quarter circle. What fraction is green as x approaches 0?

Categories
Intermediate

Boxcars

Two regular hexagons share two vertices. What fraction of the area is purple?

Categories
Intermediate

The traffic light

Two congruent circles and a triangle are contained in a circle. What fraction is coloured?

Categories
Beginner

The sailing boat

Three congruent right triangles. What fraction is shaded?

Categories
Intermediate

The corner stone

Four squares inside another square. What fraction is yellow?