Using the image, determine the length of each arc.
m RC=
m CBR =

Given:

Given that the measure of ∠CDR = 85°

We need to determine the measure of and

Measure of arc RC:

Since, we know that if a central angle is formed by two radii of the circle then the central angle is equal to the intercepted arc.

Thus, we have;

Substituting the values, we get;

Thus, the measure of is 85°

Measure of arc CBR:

We know that 360° forms a full circle and to determine the measure of arc CBR, let us subtract the values 360 and 85.

Thus, we have;

Substituting the values, we have;

Thus, the measure of is 275°

d. all of the above

step-by-step explanation:

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