Find Central Angle in Radians
Calculate the missing central angle $\theta$ (in radians) given either the arc length $s$ or sector area $A$, and radius $r$.
Key Formulas & Rules
1. Arc Length Formula:
$s = r \cdot \theta \implies \theta = \frac{s}{r}$
2. Sector Area Formula:
$A = \frac{1}{2} r^2 \theta \implies \theta = \frac{2A}{r^2}$
- Use approximate value $\pi = 3.142$ when required.
- Always round your final numerical answer to 2 decimal places (e.g.,
1.57).
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