A

1. AR= AS
2. AS = SR
3. RS = SC

B.

1. XY = AB
2. Xy = ½ (AB,CD)
3. ⟨C ≈ BD
4. .⟨A + ⟨D ≈ ⟨ B,⟨C
5. . AD = BC

C.

1. HP 1 __HEP__
2. . A = ½ ½ EO
3. HO ≈ HE
4. . OP ≈ PE
5. . ⟨ O ≈ ⟨ P,⟨H,⟨E