Nora has a piece of ribbon that is 3/4 yard long. she will use 1/2 of it to make a bow. what length of the ribbon will she use for the bow?

yards

Step-by-step explanation:

Length of the piece of the ribbon = yards

Nora will use of it to make a bow

i.e of  

Now the actual length of the ribbon will she use for the bow can be calculated  as :

=

=

Therefore, the length of the ribbon will she use for the bow = yards

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step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.