A triangle with two cevians. What is d/c-b/a?
A square containing a quarter circle, a semicircle and a circle. What is the proportion blue : green?
A circle containing an isosceles and two equilateral triangles. What is the proportion orange : blue?
A triangle with an inscribed equilateral triangle. If areas A and B add up to C, what are the proportions A : B : C?
A square is divided by six line segments. What fraction is brown?
A unit circle with an inscribed square and four semicircles. What’s the sum of the semicircle areas?
A parabola is tangent to the equal sides of an isosceles triangle in its equal vertices. Another tangent is drawn as shown. Prove that the red line segments are congruent.
A semicircle, a square, a triangle and two circles. A centre and a tangency point are highlighted. Prove that the circles are congruent.
Two equilateral triangles share a vertex. What is the proportion red : green?
Two squares share a vertex. Three other vertices form a triangle, of which one side length is given. What is its area?