Why are the triangles congruent? A clockwise rotation of 90° and a reflection across
the x-axis maps ZR to ZR', ZS to ZS' and ZT to
ZT.
3
2
1 R
A translation up 2 and to the right 2 maps RS to
R'S'. ZS to ZS', and ST to S'T'.
-2 -1
S
3 4X
1
2
- 1
pi
T
2
A reflection across the x-axis maps ZR to ZR', ZS
to ZS', and ZT to ZT'.
-3
-4
A counterclockwise rotation of 180° maps RS to
R'S, ZS to ZS and ST to S'T'.