The accepted rule for determining the angle of a jack arch states that "the skewback angle should be _____ of span of the opening for each 4" of arch depth."

Question

Quizplus · Accepted Answer

The accepted rule for determining the angle of a jack arch states that "the skewback angle should be ½" per foot of the span of the opening for each 4" of arch depth." So, option D is the correct choice.

The Accepted Rule for Determining the Angle of a Jack