In a circle with radius $r$, the area of a sector formed by an arc of length $l$ is.........
In a circle with radius $r$, the area of a sector formed by an arc of length $l$ is.........
- A
$\frac{1}{2} r^{2} l$
- B
$\frac{4}{3} r l$
- C
$\frac{3}{2} r l$
- D
$\frac{1}{2} r l$
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