9. Using absolute value to find the distance between points (A)
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Lesson objective: Apply the ability to use absolute value to find the distance between points.
This lesson provides an opportunity for students to apply their knowledge and understanding of absolute value to a mathematical situation. Students are asked to find the perimeter of a rectangle using the coordinates of its vertices and must give the coordinates of a square enscribed within the rectangle.
Key Concept students will use:
 Use absolute value to find the distance between points.
Skills students will use:
 Students will find the distance between two points with a common coordinate that are positioned in different quadrants.
 Students will find the distance between two points with a common coordinate that are positioned in the same quadrant.
 Students will give the coordinates of points when given their distance apart.
Students engage in Mathematical Practice 7 (look for and make use of structure) as they apply their knowledge of coordinate pairs and absolute value to determine distances on the coordinate plane.
Key vocabulary:
 absolute value
 perimeter
 quadrant
 xaxis
 yaxis
Special materials needed:
 scrap, blank coordinate planes