This paper concerns itself with
continuous families of linear embeddings of triangulated complexes into E2. In [2]
Cairns showed that if f and g are two linear embeddings of a triangulated complex
(C,T) into E2 so that there is an orientation preserving homeomorphism k of
E2 with k ∘ f = g, then there is a continuous family of linear embeddings
ht: (C,T) → E2(t ∈ [0,1]) so that h0= f and h1= g. In this paper we
prove various relative versions of this result when C is an arc, a 𝜃-curve, or a
disk.