2. POINT REFLECTIONS Review Mrs. Erickson

3. A B C B’ A’ C’ Point Reflections

4. What is preserved?  distance is preserved  angle measure is preserved  midpoint is preserved  collinearity is preserved The figure is always congruent to its image. R p = “the reflection thru point p” R p (A)=A’  the image of A under a reflection in point P is A’

5. Reflect thru the origin Find A’: A (3,5) Reflect thru the origin Find B’: B (-2,4) y Point Reflections x A (3,5) A’ (-3,-5) B (-2,4) B’ (2,-4)

6. Reflect thru the origin Find A’: A (-3,2) Reflect across x-axis Find B’: B (-3,2) Reflect across y-axis Find C’: C (-3,2) y Point Reflections x C’ (3,2) B’ (-3,-2) (-3,2) A’ (3,-2)

7. A reflection in the origin is the same as first reflecting across the x-axis, then across the y-axis. Point Reflections

8. Done! Little Boy: “My math teacher is crazy.” Mother: “Why?” Little Boy: “Yesterday she told us that five is 4+1. Today she is telling us that five is 3+2.”