I have the question "What angle is subtended at the center of a circle of radius $2$ km by an arc of length $9$ m?"
I am not sure which formula to use to find the subtended angle.
$\endgroup$2 Answers
$\begingroup$Hint. Recall that the length of an arc of a circle and the corresponding angle subtended at the centre are proportional.
$\endgroup$ 6 $\begingroup$For any circle:
$${ arc=radius*\theta}$$
Where theta is in radian.
From the given data:
$${\theta=arc/radius=0.009/2=0.0045 radians}$$
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