COPTR Stage 1 Practice Test

  • Session length

A drawing shows a length of 2.25 inches. Using the scale 1 inch = 2 cm, what is the real length?

9.0 cm

2.25 cm

4.5 cm

Interpreting scaled drawings involves converting the drawn measurement into real size using the given scale. Here, 1 inch on the drawing represents 2 cm in real life. So multiply the drawing length by the scale factor: 2.25 inches × 2 cm per inch = 4.5 cm. The real length is 4.5 cm. The other numbers would come from misapplying the scale (for example, treating inches as centimeters, or miscalculating the multiplication), but the correct method is to multiply the drawn length by 2.

1.125 cm

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