Hi Shivkumar,
Thanks for using syncfusion products.
If you want to set width/heigh in percentage then it can be achieved only by modifying the css styles of these controls.You can not directly set the width/height in %. We suggest you to set width/height in the class "ui-accordion .ui-accordion-content" for accordion control and similarly css styles for rotator control classes should be modified. Kindly download the sample for the accordion control from the following link,
Accordion-116484591.zipRegards,
Varalakshmi R.S