We have a diameter 2 half circle. Point C,D,E divide the diameter AB into four pieces. The angles marked by ○ are all 45°. What is the difference between the blue area and yellow area?

Question

Answer-Guess-Matrix Math Question 17

What's your answer?
What's your guess for other people's answer (if there are multiple, use comma to seperate, e.g, 1,2,4)?