Answer:
84.82
Step-by-step explanation:
the missing sector is 1/4 of the circle (the arc is 90 since it is a right triangle)
the remaining sector is 3/4 of the circle
[tex]A=\pi r^{2} \\A=\pi 6^{2} \\A= 36\pi[/tex]
the whole circle is [tex]36\pi[/tex]
the remaining region is
[tex]\frac{3}{4} 36\pi \\27\pi =84.82[/tex]