Answer is a) 35 degree
- Join line AB
- IN TRIANGLE ABC-
- GIVEN- angle acb=55 degree
- angle abc=90 degree {ANGLE IN SEMICIRCLE IS RIGHT ANGLE}
- angle bac=35 degree { SUM OF ALL ANGLES IN TRIANGLE IS 180 DEG}
HENCE, X=
35 degree {ANGLES SUBTENDED IN SAME ARC ARE EQUAL}
HOPE YOU FIND THIS HELFUL....
Regards