Q.

Rise of a Jack arch is kept about

A. 1/2 to 1/3 of the span
B. 1/3 to 1/4 of the span
C. 1/4 to 1/8 of the span
D. 1/8 to 1/12 of the span
Answer» D. 1/8 to 1/12 of the span
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