Puzzles
Circles
Source: MathsJam
There is a quarter circle with radius 2r and centre A and two semi circles with radius r and centres B and C.
Prove that the red area is equal to the blue area.
If you enjoyed this puzzle, check out Sunday Afternoon Maths I,
puzzles about 2d shapes, or a random puzzle.
puzzles about 2d shapes, or a random puzzle.