IXL - Midpoint formula: find the midpoint (Geometry practice)

R(1, 1) and S(9, 7) are the endpoints of a line segment. What is the midpoint M of that line segment?

Write the coordinates as decimals or integers.

M = (, )

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question

A line segment has the endpoints J(1, 1) and K(1, 3). Find the coordinates of its midpoint M.

Write the coordinates as decimals or integers.

M = (, )

key idea

The midpoint formula is

x1 + x2

y1 + y2

where M is the midpoint of a line segment with endpoints at (x1, y1) and (x2, y2).

solution

Use the midpoint formula to find the midpoint M. Plug in J(1, 1) for (x1, y1) and K(1, 3) for (x2, y2).

x1 + x2

y1 + y2

Plug in (1, 1) and (1, 3)

1 + 1

1 + 3

Plug in (1, 1) and (1, 3)

Add

Simplify

(1, 2)

Simplify

JK has its midpoint M at (1, 2).

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Lesson: Midpoint formula

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