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20. A circle KLM has centre O. The diameter KM=15cm and chord KL=12cm. E is a point on LM. If OE is perpendicular to

20. A circle KLM has centre O. The diameter KM=15cm and chord KL=12cm. E is a point on LM. If OE is perpendicular to the chord LM, calculate the length of EM. K 12 cm 15 cm O L M

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