Three tangent semicircles and a circle. One tangency point is shown. Prove that red : green = yellow : blue.
Categories
Three tangent semicircles and a circle. One tangency point is shown. Prove that red : green = yellow : blue.
A triangle with two circles and two line segments. Prove that it is isosceles.
A square with a circle and a tangent. The tangency point lies on the diagonal. What fraction is red?
A square containing a semicircle, a circle and two tangents. What’s the angle α?
A square is divided in three parts. What fraction is red?
A triangle and two semicircles. What’s the angle α?
Four equilateral triangles. Prove that the red quadrilateral is a parallelogram.
Two circles, one having its centre on the other, and four line segments. Prove that the three coloured line segments are congruent.
An equilateral triangle and a rectangle. What’s the angle α?
A square with an extended side. What’s the angle α?