A quarter circle inside a square divides a line segment in parts of length 4 and 6. What is the square’s area?
Tag: circle
Colour confinement
A semicircle with three tangent line segments. What is its area in terms of lengths a and b?
The earth projection
A circle touching a semicircle and a triangle. What is the proportion blue : green?
Crazy frog
A regular pentagon, two semicircles and two chords. What’s the length proportion a : b?
The pointy shoe
A quarter circle, a semicircle and a triangle. What’s the angle α?
Cordon sanitaire
Two perpendicular lines and a third line. Four circles are tangent to all three lines. Prove that their areas satisfy AB=CD.
The green zone
A quarter circle and a right triangle inside a square. One of the vertices of the triangle is the square’s centre. What fraction of the square’s area is green?
The kissing circles
A rectangle with three touching quarter circles. What fraction of its area is coloured?
The commons
Two touching circles and a common tangent. Three triangles are formed by tangency points and centres. What is the area of the green triangle X in terms of areas A and B?
Softening the edges
A quarter circle contains a semicircle and a square. What fraction of the area is purple?