Lesson 1-3Distance and

Midpoints

• Distance-The distance between two points is the length of the segment with those points as its endpoints.

• Irrational number-Is a number that cannot be expressed as a terminating or repeating decimal.

• Midpoint-The midpoint of a segment is the point halfway between the segments.

• Segment bisector-A segment, line, or plane that intersects a segment at its midpoint.

Find Distance on a Number Line

Use the number line to find QR.

A. 2

B. 8

C. –2

D. –8

Use the number line to find AX.

Find Distance on a Coordinate Plane

Find the distance between E(–4, 1) and F(3, –1).

A. 4

B.

C.

D.

Find the distance between A(–3, 4) and M(1, 2).

Find Midpoint in Coordinate Plane

A. (–10, –6)

B. (–5, –3)

C. (6, 12)

D. (–6, –12)

Find the Coordinates of an Endpoint

A. (3.5, 1)

B. (–10, 13)

C. (15, –1)

D. (17, –11)

Find the coordinates of R if N (8, –3) is the midpointof RS and S has coordinates (–1, 5).

Use Algebra to Find Measures

A. 1

B. 10

C. 5

D. 3