Sector: Area (in Radian)
How to find the area of a sector whose central angle is in radian: formula, 1 example, and its solution.
r = 6
θ = 2π/3
So A = [1/2]⋅62⋅[2π/3].
Reduce the numerator 62 to, 62/6, 6
and cancel the denominator factors 2 and 3.
6⋅2π = 12π
So 12π is the answer.