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## X marks the spot!

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**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.**1**0 0 -1 1 -1**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.**Where am I?**D Name the quadrant and the ordered pair for each point: A.__________ B.__________ C.__________ D.__________ E.__________ A C E B**Questions**• Can someone tell me what are some of the common uses of the coordinate plane? http://www.miniclip.com/games/battleships/en/