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How many chords are determined by seven points on a circle?

How do you do it, not answer.

  • URGENT! MATH! HELP! -

    How many chords are determined by seven points on a circle?

    How do you do it, not answer.

  • Math -

    each point of the 7 is connected to 6 others.

    So, going through all 7 points, you have 7*6 = 42 connections.

    But, having gone all the way around, you have drawn each chord twice, once from each end. So, divide the total by 2 to get

    7*6/2 = 21 chords

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