The circumstances of z is 84cm. what is the length of xy (the mirror arc)

B

Step-by-step explanation:

arc length = circumference × fraction of circle

                 = 84 × = 21 cm

need more information

step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c