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60² = 68² - (R-12)²
3600 = 4624 - (R-12)²
(R-12)² = 4624 - 3600
R-12 = √1024
R-12 = 32
R = 32+12
R = 44 cm
maka
s² = d² - (R - r)²
(R - r)² = d² - s²
= 68² - 60²
= 4.624 - 3.600
= 1.024
(R - 12)² = 1.024
R - 12 = √1.024
R - 12 = 32
R = 44 cm
Jadi, jari-jari lingkaran satunya adalah 44 cm
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