This Instructional Activity is a part of the Lesson 6, Unit 2, Grade 8. Students learn that a rotation of 180 degrees moves a point on the coordinate plane (𝑎, 𝑏) to (−𝑎,−𝑏). Students learn that a rotation of 180 degrees around a point, not on the line, produces a line parallel to the given line. Recall, a rotation of 180 degrees around 𝑂 is a rigid motion so that if 𝑃 is any point in the plane, 𝑃, 𝑂, and 𝑅𝑜𝑡𝑎𝑡𝑖𝑜𝑛(𝑃) are collinear (i.e., they lie on the same line).