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24² = 25² - (R - r)²
576 = 625 - (R - r)²
(R - r)² = 625 - 576
(R - r)² = 49
R - r = √49
R - r = 7
R - 4 = 7
R = 7 + 4
R = 11 cm
x= 24 cm
r = 4 cm
d = 25 cm
R = ?
d^2 = x^2 + (R-r)^2
25^2 = 24^2 + (R-r)^2
(R-r)^2 = 25^2 -24^2
(R-4)^2 = 49
R-4 = 7
R=11 cm
jadi panjang jari-jari lingkaran lainnya adalah 11 cm