赤の面積は青の面積の何倍くらい？【ゆっくり解説】

When three points are randomly selected within the circle, we calculate (expected value of the red area)/(expected value of the blue area). As a bonus, we will also calculate the expected value of the blue area itself. (High school calculus is assumed to be known.) References: G. R. Grimmett and D. R. Stirzaker, One Thousand Exercises in Probability: Third Edition (English Edition), Oxford University Press, 2020, p. 64. https://math.stackexchange.com/questi... (viewed 2025-06-28) 0:00 Problem 0:46 Supplementary information 1:24 Hint 2:13 Solution 5:40 Bonus Part 1 8:29 Bonus Part 2 11:03 Bonus Part 3 13:11 Bonus of the bonus Music: MusMus === X: https://x.com/evima0 Discord:   / discord