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Summary

The radian measure of a central angle is defined as the ratio of the length of the arc the angle subtends, s, divided by the radius of the circle, r.
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To convert degrees to radians, one must multiply the degrees by 1.
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Summary
The length of an arc is a portion of the circumference of a circle, and the degree measure of an arc is equal to the measure of the central angle that intercepts the arc. The radian measure of a central angle is defined as the ratio of the length of the arc the angle subtends, s, divided by the radius of the circle, r. To convert degrees to radians, one must multiply the degrees by 1.

Arc Length and Radian Measure - MathBitsNotebook(Geo - CCSS Math)
mathbitsnotebook.com

Summary
The radian measure of a central angle θ of a circle is defined as the ratio of the length of the arc the angle subtends, s , divided by the radius of the circle, r . Note that when s = r , we get θ expressed as one radian

Radian Measure - MathBitsNotebook(A2 - CCSS Math)
mathbitsnotebook.com

Our arc length calculator can calculate the length of an arc of a circle and the area of ... How do you find arc length without the radius?

Arc Length Calculator
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Find the length of an arc and the area of a sector with our simple arc length calculator. ... If we are only given the diameter and not the radius we can ...

Arc Length Calculator | Pi Day
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