Categories
Beginner

The miniature version

Two rectangles share a vertex. Two line segments connecting opposing vertices and the common side intersect in a single point. Prove that the rectangles are similar.

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Intermediate

The kingsize bed

A rectangle with an inscribed right triangle. What is ac/bd?

Categories
Intermediate

The obstructed view

A rectangle and two squares of side length a and b respectively. What is the red area in terms of a and b?

Categories
Beginner

Touché

A square containing a rectangle and a tangent quarter circle. What fraction is orange?

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Advanced

The freight elevator

Four points A, B, C and D form a quadrilateral. Prove that it is a rectangle if and only if for an arbitrary point P we have PA2+PC2=PB2+PD2.

Categories
Intermediate

The red sash

Two squares and a rectangle. What is area of the rectangle in terms of square sides a and b?

Categories
Beginner

The dome tent

A rectangle with a diagonal and an inscribed semicircle. What is red : green : blue?

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Advanced

The crowded house

Three circles are inscribed in a rectangle. What is the area X in terms of A and B?

Categories
Advanced

The letter box

A rectangle with a diameter and two inscribed squares. What is its area in terms of the square areas A and B?

Categories
Beginner

The tornado

A quadrilateral covers exactly half of the area of a rectangle. Find the length x in terms of a, b and c.