Plz solve i need the formula to find TSA OF A HOLLOW CYLINDER WHEN DIAMTER IS GIVEN TO US IN EXAM PAPER PLZ DO NOT CONVERT INNER AND OUTER DIAMTER INTO RADIUS I NEED NEW FORMULA TO FIND TSA OF A HOLLOWCYLINDER IN TERMS OF DIAMTER SIR PLZ ANS IN A SHEET OF PAPER I AM STRUGGLING LIKE A HELL THEY WILL ASK IN TOMMOROW EXAM PLZ DO NOT USE THE OLD FORMULA I NEED FORMULA IN OUR SCHOOL THEY WILL ASK IN DIRECT FORMULA IN TERMS OF DIAMETER SIR