What is the size of a four-foot full open?

The size of fully opened quadruped is 138×69 cm. This is the size of a rice paper. "How many times" refers to dividing a piece of paper into several equal parts, and the size of one part. Quarto is to divide a piece of paper into four equal parts and take one.

There are two kinds of rulings:

1. Fold the two wide edges of a piece of paper in half by overlapping and aligning, and fold it again by this method. The size of this quartile is 34.5×69 cm.

2. First, fold the two wide edges of a piece of paper in half, and then fold the original two long edges once. This quadrupling is the same size as the previous method, but the paper presents different lines.