Questions: Find the radian measure of the central angle θ given the radius r and the arc-length s transcribed by θ. r=10 in.; s=21 in.
Transcript text: Find the radian measure of the central angle $\theta$ given the radius $r$ and the arc-length $s$ transcribed by $\theta$.
\[
r=10 \text { in.; } s=21 \text { in. }
\]
Solution
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