The length of a mirror arc is 2/9 of the circumference of the circle. Write the measure of the angle (in degrees) subtended by the arc at the centre of the circle.
In the word ACCUMUATES, if the 1st letter is interchanged with 2nd, 3rd with 4th, 5th with 6th, 7th with 8th and 9th with the 10th, then the 6th letter from the left will be