Categories
Beginner

The cross

A rectangle of height 2 is crossed by two line segments at right angles. What is its width?

Categories
Advanced

The Bermuda Triangle

A triangle with an inscribed rectangle. What is the maximum red fraction?

Categories
Intermediate

The green flag

A square of side length 2 shares a vertex with another square that is elongated to form a green rectangle. What is the rectangle area?

Categories
Intermediate

The washing line

Three squares and three common vertices. Prove that the quadrilateral ABCD is a rectangle.

Categories
Intermediate

Another brick

A rectangle and a quarter circle. What is the area of the rectangle?

Categories
Intermediate

The chef’s hat

Two regular hexagons connected by a rectangle. Prove that the five vertices lie on a circle.

Categories
Beginner

The throne

A rectangle with a horizontal line and a diagonal. The red and golden regions have the same area. What fraction is coloured?

Categories
Intermediate

Two hefty volumes

Two congruent rectangles inscribed in a square. What fraction of the area is blue?

Categories
Intermediate

The hanging door

Two congruent rectangles support a third rectangle. What fraction is blue?

Categories
Intermediate

The paper hat

A rectangle and several triangles. The orange triangle has the same area as the green trapezium. What’s the total coloured fraction?