22. A sector of 120Â° cut out from a circle has3an area of 9sq.cm. W

1.	22. A sector of 120Â° cut out from a circle has3an area of 9sq.cm. What is the radiof the circle?(A) 3 cm(C) 3.5 cmus(B) 2.5 cm(D) 3.6 cm
Answer» area of a sector of circle = πr² x angle / 360 = 3.14 x r² x 120 / 360 = 66/7= 3.14 x r² x 1/3 = 66/7= 3.14 x r² x 0.33 = 66/71.0362 r² = 66/7and , r² = 9/1.0362r² = 9r = approx 3 cm

22. A sector of 120Â° cut out from a circle has3an area of 9sq.cm. What is the radiof the circle?(A) 3 cm(C) 3.5 cmus(B) 2.5 cm(D) 3.6 cm

Answer»

area of a sector of circle = πr² x angle / 360

= 3.14 x r² x 120 / 360 = 66/7= 3.14 x r² x 1/3 = 66/7= 3.14 x r² x 0.33 = 66/71.0362 r² = 66/7and , r² = 9/1.0362r² = 9r = approx 3 cm