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jari-jari = OP
OP = 1/∛ . 4∛
= 4 cm
maaf kalau salah
r² = ( r + r)² - (4√3)²
r² = 4r² - 48
r² - 4r² = - 48
-3r² = -48
r² = 16
r = √16
r = 4