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PQ² = AB² - (r1 + r2)²
16² = 20² - (5 + r2)²
256 = 400 - (5 + r2)²
(5 + r2)² = 400 - 256
(5 + r2)² = 144
5 + r2 = 12
r2 = 7 cm
Jadi, panjang jari-jari lingkaran B adalah 7 cm
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