First, read the integer from major ruler 0 to minor ruler 0, as shown in figure (b), that is, 1. Read 1, and then look at the line where the auxiliary ruler and the main ruler overlap. Decimal is the number of squares overlapped by auxiliary rulers, multiplied by 0.02, a large square is five squares, multiplied by 0.2 is 0. 1, and the next three squares are 0.06.

Graph c is15.02mm.

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