If aruler is used for measuring the perimeter of an object, then how would you measure the perimeter of the outside of an object?

Answer choices:
- With a scale.
 - With a ruler.
 - With a thermometer.
 - With a hydrometer.
 - by indirect light
 - Under 32 degrees
 - focusing a lens
 - electron microscope

 

  With a ruler.        