Area formulas for polygons

Question 1

Formula if given the apothem and side length

Answer 1

N(1/2)A(SL)

Question 2

Formula if only given the apothem

Answer 2

N(A^2)TAN(central angle/2)

Question 3

Formula if only given the side length

Answer 3

N(Side length/2^2)/TAN(central angle / 2)

Question 4

Formula if only given radius

Answer 4

N(1/2)(radius)(radius)SIN(central angle)