## Reflection: Developing a Conceptual Understanding Finding Perimeter and Area in the Coordinate Plane - Section 3: Cooperative Activity

The distance formula serves the same purpose as a ruler, right? But does it give the same information as a ruler does? Not exactly. I realized the need to clarify this when my students started measuring distances on their graph paper and wondering why the answer from the distance formula never matched what their rulers were telling them.

In the following video, I explain the distinction between coordinate units and real units in order to make an important connection between the output of the distance formula and what students see on their rulers.

The importance of understanding units
Developing a Conceptual Understanding: The importance of understanding units

# Finding Perimeter and Area in the Coordinate Plane

Unit 2: Geometry Foundations
Lesson 11 of 14

## Big Idea: It's Gridlock. Trapped inside the coordinate plane, armed only with coordinate pairs and formulas, students must find perimeters and areas of triangles and rectangles.

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Standards:
Subject(s):
Math, coordinate geometry, area, perimeter
70 minutes

### Anthony Carruthers

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