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# 6.4 Coodinate Plane

coordinate plane A plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis
x- axis the horizontal axis on a coordinate plane that displays the first umber of an ordered set
y-axis the vertical axis on a coordinate plane
origin (0,0) Intersection of the x and y axes. Center of the coordinate plane.
ordered pair A pair of numbers used to locate a point on a graph (x,y)
reflection A transformation of a point/ figure that flips the point/figure across the x or y axes.
Reflection over x-axis x coordinate stays the same and change the y coordinate to its opposite.
opposites 2 numbers who have the same absolute value but are on opposites sides of zero on the number line.
Reflection over y-axis y coordinate stays the same and change the x coordinate to its opposite.
quadrant one of four sections into which the coordinate plane is divided
unit distance when you count the LINES between 2 points.
distance given two points (in the same quadrant- same sign) Ignore the coordinates that are the same. Subtract the coordinates that are different.
Ex. Distance between ( 1 , 8 ) and ( 1 , 4) The ones are the same, so we are looking at the 8 and 4. Because they are both the same sign, we subtract. 8-4 = 4 units apart
Absolute value The distance a number is from zero on a number line. ALWAYS POSITIVE
Find the distance between two points (in different quadrants- different signs) Ignore the coordinates that are the same. Add (the absolute value) of the coordinates that are different.
Ex. Distance between ( 1 , -8 ) and ( 1 , 4) The ones are the same, so we are looking at the -8 and 4. Because they have different signs, we take the absolute value (positive) of each number and add. 8+4 = 12 units apart
Perimeter of a rectangle Add all the sides On a graph count the SIDES
Area of a rectangle A=lw or bh On a graph count the BOXES
distance given a graph when you count the LINES between 2 points.
integer a number that can be written without a fraction or decimal. a whole number, can be positive or negative.
Square A quadrilateral with 4 sides that are equal and has all 90 degree angles
Area of a composite figure find area of the simple shapes and add them together On a graph count the BOXES
Perimeter of a composite figure Add all the sides On a graph, count the SIDES
Area of a triangle A=1/2bh The height must make a right angle with the base

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