144.50
step-by-step explanation:
21.5 x 13.4=288.10 divide by 2
answer would be 8.64 or s = 11π/4 inches
s = r θ
where s = arc length
r = radius = 3 inches
θ = central angle in radians = ( π /180)*165
s = 3(π/180)*165
= 8.64 inches