X marks the spot!

The Coordinate Plane

Lesson 1

Geometric quadrant with plumb bob.

A quadrant is an instrument that is used to measure angles up to 90°.

The coordinate plane is formed by two number lines in a plane that intersect at right angles. The point of intersection is the zero on each number line.

01-1

1

-1

0

The two number lines are called the axes.

The horizontal axis is called the x-axis.

The vertical axis is called the y-axis.

The two axes divide the coordinate plane into four quadrants.

The point where the axes intersect is called the origin.

A

B

C

D

E

Name the quadrant and the ordered pair for each point:

A.__________

B.__________

C.__________

D.__________

E.__________

Where am I?

Questions

•Can someone tell me what are some of the common uses of the coordinate plane?

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