# Springfield Renaissance Geometry 2016-17 Lesson 15

- Author:
- Neal Creeden

- Topic:
- Geometry

## DO NOW

Ashley and Tori are arguing about what kind of transformation is occurring above. Ashley claims that there is a reflection over line AB and then another reflection over CD. Tori claims that there is simply one rotation.
Who is correct? If Tori is correct then where is the center of rotation?

## Lines of Symmetry

Is there a line of symmetry in the figure above? If there is, draw it. What relationship does the line have with the figure (beyond being a line of symmetry?)

Which of the following figures have multiple lines of symmetry?

## Finding the circumcenter

Find the perpendicular bisector of two of the three sides of the triangle above. The intersection point is known as the circumcenter