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GSPD² = jarak² - R²
36² = 39² - R²
1.296 = 1.521 - R²
R² = 1.521 - 1.296
R² = 225
R = √225
R = 25 cm
R + r = 25
6 + R = 25
R = 25 - 6
R = 19 cm