How do you find the actual measurement in scale drawing?

To find the actual measurement in a scale drawing, first identify the scale used in the drawing (e.g., 1:100 means 1 unit on the drawing equals 100 units in reality). Measure the length of the object in the drawing using a ruler. Then, multiply that measurement by the scale factor to convert it to the actual size. For example, if the length measured is 2 cm on a 1:100 scale, the actual length would be 2 cm × 100 = 200 cm.