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⇒ AC² = 28² + 21²
⇒ AC² = 784 + 441
⇒ AC² = 1.225
⇒ AC = √1225
⇒ AC = 35 cm
karena AC adalah diameter lingkaran, maka
d = 35 cm
⇒ 2r = 35
⇒ r = 35/2
⇒ r = 17,5 cm
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