Respuesta :
Answer:
A = pi/2
Step-by-step explanation:
Area of a sector is given by
A = 1/2 r^2 theta when theta is given in radians
We know the area of the circle (pi * r^2) so we multiply by pi/pi
A = 1/2 pi/pi r^2 theta
A = 1/(2* pi) * pi r^2 theta
= 1/(2* pi) * Ac theta where Ac is the area of a circle
Substituting what we know Ac = 9 pi and theta = 1/9 * pi
A = 1/(2* pi) * 9*pi 1/9 * pi
A = 1/(2* pi) * pi^2
A = 1/2 * pi
A = pi/2
Answer:
Its [tex]\frac{\pi }{2}[/tex] .
Step-by-step explanation:
Because the work shown below will show you how:
[tex]\frac{\theta}{2\pi } = \frac{A_s}{A_c}\\\frac{1}{9} /2\pi = \frac{A_s}{9\pi } \\\frac{1}{18} = \frac{A_s}{9\pi } \\\frac{1}{18} * 9\pi = A_s\\=\pi/2[/tex]