The angle subtended by an arc on the circumference is 80 degrees. The angle subtended by it at the centre is
120 degrees
100 degrees
160 degrees
130 degrees
The angle subtended by an arc at the centre is 120 degrees. The angle subtended by it on the circumference is
find the angle in degrees subtended at the centre of a circle by an arc whose lenght is 2.2 times its radius.