Rotation in the plane preserves parallilism.
If (y , x) is the image of (x , y) by R(O , 90°) then (x , y) is the image
of (-y , x) by the same rotation.
If A' is the image of A by reflection in L, then AA' ^ L.
Translation in the plane is determined by direction only.
If (5 , -
is the image of (3 , -2) by a given translation, then the image of (3 , -2) by the same translation is (1 , 4).
If (y , x) is the image of (x , y) by R(O , 90°) then (x , y) is the image
of (-y , x) by the same rotation.
If A' is the image of A by reflection in L, then AA' ^ L.
Translation in the plane is determined by direction only.
If (5 , -
is the image of (3 , -2) by a given translation, then the image of (3 , -2) by the same translation is (1 , 4).