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Select the INCORRECT statement related to terminologies with its definition used in Arch construction.

  • A.Voussoirs: These are the wedge-shaped units forming the courses of an arch
  • B.Arcades: It is a row of arches supported on piers and carrying a wall over it
  • C.Soffit: This is the lower half of the arch between the crown and skewback
  • D.Spandril: This is space between the extrados and the horizontal line through the crown

Answer: C

The incorrect statement is the one about the soffit. The soffit of an arch is the inner (under) surface of the arch, the curved surface seen from below, and it is not the lower half of the arch between the crown and skewback. The other statements are right: voussoirs are the wedge-shaped units that make up the courses of an arch, an arcade is a row of arches on piers carrying a wall, and the spandril is the roughly triangular space between the extrados and the horizontal line drawn through the crown.

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