Posted by **dddd47906** on Monday, May 5, 2014 at 3:14pm.

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

How do you do it, not answer.

- URGENT! MATH! HELP! -
**dddd47906**, Monday, May 5, 2014 at 4:20pm
How many chords are determined by seven points on a circle?

How do you do it, not answer.

- Math -
**Steve**, Monday, May 5, 2014 at 6:45pm
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

## Answer This Question

## Related Questions

- maths - eight points lie on the circumference of a circle. one of them is ...
- math - n points are arranged on a cirlce and all the chords drawn. Let I(n) be ...
- math - n points are arranged on a cirlce and all the chords drawn. Let I(n) be ...
- Circle Geometry - chords in a circle - Let PQ, RS , and TU be parallel chords of...
- math - the number of noncollinear points needed to determine a circle Two. The ...
- Math Help - Two points are chosen uniformly at random on the unit circle and ...
- Math - Two points are chosen uniformly at random on the unit circle and joined ...
- Geometry - Two points are chosen uniformly at random on the unit circle and ...
- Math - let AB and CD be perpendicular diameters of a circle. two chords AE and ...
- algebra - Two points are chosen uniformly at random on the unit circle and ...

More Related Questions