A semicircle with three squares. The areas of the smaller squares are given. What is the area of the biggest one?
A triangle containing a semicircle and an equilateral triangle. What fraction is golden?
An equilateral triangle with three congruent squares. What’s the angle α?
Two overlapping congruent right triangles. If |AB|=15 and |BC|=7, what is the total area?
An isosceles triangle with two altitudes dividing each other in segments of length 4 and 5. What is the total triangle area?
Two isosceles triangles and a right angle. What is the proportion green : gold?
A regular hexagon and three squares. What is the proportion yellow : brown?
An equilateral triangle with an altitude. Two of its sides form the radii of the circular sector. What fraction of the area is covered by the red circle?
A square, a triangle and two equal angles. What is the angle α?
Two tangent circles and a triangle. The figure has reflection symmetry in the vertical diameter d, of which one ninth is above the horizontal chord. What fraction is pink?