A square contains a right triangle. What fraction is orange?
Tag: area
Four to twelve
A regular dodecagon and a square share two vertices. What is the area proportion square : dodecagon?
The triangular tiling
A rectangle is divided into four similar triangles. What fraction is blue?
The righteous four
Four rectangles. The green and red rectangle are similar. What’s the area proportion of the orange and the blue rectangle?
The mahogany triangle
A square contains an isosceles triangle with an extended altitude. What fraction is mahogany?
Eight corners
A regular octagon with two diagonals and two squares. What’s the area proportion of the blue to the red square?
The crown jewel
A regular dodecagon and three equilateral triangles. What’s the proportion purple : green?
The bear trap
A semicircle with two tangents and a perpendicular line segment from a tangency point. What is the blue area in terms of lengths a and b?
The oppressed minority
A square with two inscribed squares. What is the maximal proportion green : blue?
Ceteris paribus
Three circles with their centres and a triangle ABC. Given that D is the midpoint of BC, prove that quadrilateral ABEF and triangle ECF have both equal perimeter and equal area.