When the pitch of the rivet joints is p, what will be the row pitch Pr for chain riveting?

When the pitch of the rivet joints is p, what will be the row pitch Pr for chain riveting? Correct Answer Pr = 0.8p

Row pitch is defined as the distance between two adjacent rows of rivet joints. When p is the pitch, then the row pitch for the chain riveting is 0.8 times the pitch. In chain riveting, the rivets are placed in rows such that the rivets in the adjacent rows are directly opposite to each other.
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