Question

Is the area of a key on a calculator 6.5 mm^2 , 65 mm^2 or 0.65 cm^2?

Answer 1

Answer:

65  $mm^2$ or 0.65 $cm^2$ which are exactly the same area

Step-by-step explanation:

Notice that 65  $mm^2$ is exactly the same as 0.65 $cm^2$.

The most likely answer is 65  $mm^2$, since 8 mm by 8 mm is a reasonable size for a square shaped key of a hand-held calculator to fit a human finger.

The answer 6.5  $mm^2$  is an area too small (about a square 3 mm by 3 mm which is to small for a human finger.  It would be more appropriate for a pen or point of some type.