A composition of transformations maps ΔXYZ to ΔX"Y"Z".

Triangle X Y Z is reflected across the line of reflection m to form triangle X prime Y prime Z prime. Triangle X prime Y prime Z prime is rotated 90 degrees about point X prime to form triangle X double-prime Y double-prime Z double-prime.

The first transformation for this composition is [], and the second transformation is a 90° rotation about point X'.

a 180° rotation about point X
a 270° rotation about point X
a translation to the right
a reflection across line m