Arc length

The formula for arc length (\(l\)) is:

\(l=rθ\)

where \(r\) is the radius, and
\(θ\) is the angle in radians.

Area of a sector

The formula for area of a sector (\(A\)) is:

\(A=\dfrac{1}{2}r^2θ\)

where \(r\) is the radius, and
\(θ\) is the angle in radians.