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AS level maths past paper question. I’m stuck watch

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    Could someone who is taking a/as level or additional GCSE maths please help me with this

    The diagram shows a flexible price of card in the form of a sector of a circle with centre A and radius 18cm
    The card is bent and the edges AB and AC are taped together so that the card forms the curved surface of a cone with a circular base.
    Calculate the radius of the circular base.
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    the circumference of the circular base is the length of the arc of the sector.
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    Picture?
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    (Original post by RuthieG101)
    the circumference of the circular base is the length of the arc of the sector.
    Aha! Thanks very much for the help
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    no problem
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