O is the centre of the circle , OC and OB are radius of circle. OC = 21 cm and AC and AB are tangents to the circle. Find the area of sector OBC.
1
462 sq.cm
2
450 sq.cm
3
441 sq.cm
4
484 sq.cm
O is the centre of the circle , OC and OB are radius of circle. OC = 21 cm and AC and AB are tangents to the circle. Find the area of sector OBC.