Answer:63.6 units
Step-by-step explanation:
Theta=90°
Radius =9
area of sector=(theta)/360 x π x r x r
area of sector=90/360 x 3.14 x 9 x 9
area of sector=(90x3.14x9x9)➗360
area of sector=22890.6 ➗ 360
area of sector=63.535
area of sector=63.6 approximately
