Categories
Beginner

The voting pencil

A square and a rectangle share a vertex. Two triangle areas are given. What is the total area?

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Intermediate

The yardstick

A rectangle containing a circle and a line segment connecting the top side to the bottom tangency point. What is its area in terms of lengths a and b?

Categories
Intermediate

The Suresh similarity

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

Categories
Intermediate

A new slant

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

Categories
Beginner

Three squares a day

Three congruent squares inscribed in a rectangle. What fraction of the total area is green?

Categories
Intermediate

Slip slidin’ away

Two congruent squares inscribed in a rectangle with given side lengths. What is the total orange area?

Categories
Intermediate

Overlapping interests

A square, a rectangle and a circle that partially overlap. One square vertex coincides with a rectangle-circle tangency point. Prove that the area of the square equals that of the rectangle.

Categories
Advanced

Two moons

A rectangle with two congruent circles, a semicircle and a common tangent. What is the proportion of side lengths a : b?

Categories
Intermediate

The rising sun

A rectangle with a circle and a semicircle. What is the proportion red : blue in terms of a and b?

Categories
Beginner

Missing pieces

A rectangle is divided in six similar triangles. What is the proportion green : yellow : red : blue?