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GL = 12 cm
P = 20 cm
r = 9 cm
dit : R?
dijwb :
(R-r)² =P² - D²
(R-9)² = 20² - 12²
(R-9)² = 400 - 144
(R-9) = √256
R-9 = 16
R = 16+9
R = 24 cm