the length of a tagnent from point A at the distance 5 cm from its centre of the whole is 4 cm ,find the radius of the circle
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Answer:
=>AB²=AB²+OB²
=>4cm²=5cm²+OB²
=>16cm=25cm+OB²
=>OB²=25-16
=>OB=√9
=>OB=3cm
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