Lesson 9

Finding Distances in the Coordinate Plane

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Lesson Narrative

In this lesson, students continue to apply the Pythagorean Theorem to find distances between points in the coordinate plane.

Students who successfully answer the problems in the second activity use the structure of the coordinate plane to draw a right triangle, an example of looking for and making use of structure in the coordinate plane (MP7).


Learning Goals

Teacher Facing

  • Calculate the distance between two points in the coordinate plane by using the Pythagorean Theorem and explain (orally) the solution method.
  • Generalize (orally) a method for calculating the length of a line segment in the coordinate plane using the Pythagorean Theorem.

Student Facing

Let’s find distances in the coordinate plane.

Learning Targets

Student Facing

  • I can find the distance between two points in the coordinate plane.
  • I can find the length of a diagonal line segment in the coordinate plane.

CCSS Standards

Addressing

Building Towards

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