Fact 1: Aruler is used for measuring the length of an object.

Fact 2: Perimeter is the total length around the object.

Given the two facts above, answer the question "How would you measure the perimeter of the outside of an object? " with the following options: 
- 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.       