Categories
Intermediate

Squaring the circle

Two perpendicular squares inside a circle. The circle centre is located on the side of one square. The line segment connecting two vertices has length a. What is the circle area?

Categories
Beginner

The Common Brimstone

A square divided by three line segments. What’s the proportion green : yellow?

Categories
Intermediate

The Suresh similarity

Two squares and a rectangle. Prove that the red triangles are similar.

Categories
Beginner

Tension control

Three squares and a line segment of which a vertex is the midpoint. What is the proportion purple : green?

Categories
Intermediate

A new slant

Two squares and a slanted rectangle share three vertices. What is the total area?

Categories
Intermediate

Equilibrium

Three squares and a circle. The areas of the squares are given. What is the area of the circle?

Categories
Intermediate

House of the rising sun

A semicircle, a circle, a square and an equilateral triangle. The two points are the tangency point and the semicircle centre. What fraction of the total area is yellow?

Categories
Advanced

The square of Amaresh

A right triangle having semicircles along its perpendicular sides and two smaller inscribed circles. Prove that the orange quadrilateral is a square.

Categories
Intermediate

Il tricolore

Two squares share two vertices. A line segment connects two other vertices, forming the base of three triangles. What is the proportion green : white : red?

Categories
Intermediate

Two square pegs

Two squares and a circle. What is the proportion a : b?