Categories
Intermediate

The folded triangle

An equilateral triangle is folded with its left side at right angles with the base. What fraction of the total triangle is shaded?

Categories
Beginner

The green kimono

An equilateral triangle and three squares. What’s the angle?

Categories
Advanced

The wheelbarrow

A circle and two semicircles are nested as shown. What’s the proportion of their respective radii a : b : c ?