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= √(30² + (21 - 5)²)
= √(30² + 16²)
= √(900 + 256)
= √(1.156)
= 34 cm
7. AB = √(Jp² - (R - r)²)
= √((7 + 4)² - (7 - 4)²)
= √(11² - 3²)
= √(121 - 9)
= √(112)
= 4√7 cm