Categories
Beginner

The dirty thirties

A triangle containing a semicircle and a circular sector centred in the right vertex. What is blue : green?

Categories
Intermediate

Scratching the surface

Three tangent semicircles and two coloured triangles. What’s the proportion yellow : green?

Categories
Intermediate

The seventh bell

A regular hexagon shares a vertex with an equilateral triangle of area 7. What is the area of the hexagon?

Categories
Beginner

Longing for spring

Four semicircles and three line segments. What’s the proportion yellow : orange?

Categories
Advanced

The common ground

Two squares share a vertex. Two other vertices are 4 units apart. A third green square has the centres as opposite vertices. What is its area?

Categories
Intermediate

Rising bread

A regular hexagon with a diagonal and a circular arc centred in a side midpoint. What fraction is yellow?

Categories
Beginner

The double bottom

A regular hexagon and a square share a vertex. What is the area proportion square : hexagon?

Categories
Beginner

Eleven

A square contains a yellow right triangle with an area of 11. What is the square’s area?

Categories
Intermediate

Black and blue

A square with an extended side inside another square. What fraction of the latter is blue?

Categories
Beginner

Almost sunk

A square contains a right triangle. What fraction is red?