If line n bisects CE, find CD. ​

ANSWER:
x=9, CD=15

EXPLANATION:
Since line n bisects CE, and the word “bisect” means to divide into two congruent parts, we can infer that CD=DE.

We can then substitute in x+6 in place of CD, and 4x-21 in place of DE, creating the equation x+6=4x-21.

After solving for x, we can then plug in the x-value of 9 into the expression for CD, and get the final answer of 15.

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.

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