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D4 - A1 - B3 - C2
A3 - D2 - C4 - B1
C1 - B4 - A2 - D3
(r+4)² = 4r²
r² + 8r + 16 = 4r²
3r² - 8r - 16 = 0
3r +4
r - 4
r - 4 = 0 → r = 4