# Geometry

posted by .

If there are 10 points on a lone how many line segements does that make?

• Geometry -

If the 10 points include the two endpoints,
then a line segment is identified by 2 points at a time
so the number is
C(10,2) = 45

e.g. suppose you label the points
A B C D ... J
then possible line segments are
AB
AC
..
AJ
BC
BD
..
BJ
..
IJ
that is : 9+8+7+6+5+4+3+2+1 = 45

## Similar Questions

1. ### Conjectures-Geometry

Given: Segements JK, KL, LM, MN, and NJ with only J, K, and L collinear. What is the Conjecture?
2. ### geometry

Decide which one of the following statements is false. a. any three points lie on a distinct line. b. three noncollinear points determine a plane. c. a line contains at least two points. d. through any two distinct points there exists …
3. ### geometry

We are learning about proofs. We drew lines between noncollinear points. Our table showed 2 points >> 1 line segment, 3 point >> 3 line segments, 4 points >> 6 line segments, 5 points >> 10 line seg, 6 points …
4. ### geometry

Which geometric figure could not be drawn using both perpendicular line segements and parallel line segements?
5. ### Geometry

Okay heres the pic. There is a plane with points B,D, and E.those [oints are collinear in the plane. And also outside of the plane is points A, and C. and those points are collinear outside of the plane.thought Line AC intersect at …
6. ### geometry

Joey plots a point P on the line AB, as shown. Which statement is true?
7. ### Analytic Geometry - Reflecting points over lines

Let P = (5,1), and let Q be the reflection of P over the line y = 1/2x + 2. Find the coordinates of Q. I don't understand how to start?
8. ### Geometry

Points G and H lie on line k and have coordinates (2,0) and (-1,9), respectively. Which of the following points is also on line k ?
9. ### geometry

I have to construct my initials J and E geometrically. I drew a base line with two points. Then I drew a line through them. I thought this was right for the E but it's not. What am I doing wrong?