Question

explain how arc length and the measure of the central angle of a circle are related

Answer 1

Do you know how to calculate circumference?
And do you know what radian measure is?

Answer 2

radian measure is the unit that is in the circle as a measure

Answer 3

Right, C=2πr, and a full circle is a central angle measure of 2π radians, so
arc length (part of the circumference) = radius × central angle (in radians).

Answer 4

so this answers the question?

Answer 5

It gives you enough information to answer the question.
It's a formula for calculating one from the other and thus describes the relation, but maybe you'd like to put that in your own words.

Answer 6

oh okay Thank you!