The length of the part in the drawing made on a scale of 1: 20 is 1.8 cm. What is the length of this part?

To answer the question posed, first let’s remember what scale is. The scale is the ratio of the dimensions of the part in the drawing to the dimensions of the part in reality. Since, in a given drawing, the scale is 1:20, therefore, the part in the drawing is reduced 20 times relative to its real size. Thus, to find the real length of the part, it is necessary to multiply its length in the drawing by 20. Calculate:

1.8 * 20 = 36

That is, the length of the part is 36 centimeters.

Answer: The length of the given part is actually 36 centimeters.