Can someone answer these two questions : ). no dum answers don’t just answer cuz you want points

A) 1.You must apply the formula for calculate the area of a regular polygon:
 A=Pa/2
 P  is the perimeter
 a is the apothem
 2.Solve for a:
 a=2A/P
 a=2(13.60 cm²/(2.25 cm²x8)
 a=1.51 cm (Apothem)
b)Tan^-1(A°)=7/13
 A°=28.30°
 Tan^-1(B°)=13/7
 B°=61.69°