Three rectangles $\displaystyle A_{1},A_{2}: : and: : A_{3}$ have the same area. Their lengths $\displaystyle a_{1},a_{2}: : and: : a_{3}$ respectively are such that $\displaystyle a_{1}< a_{2}< a_{3}$. Cylinders $\displaystyle C_{1},C_{2}: : and: : C_{3}$ formed from $\displaystyle A_{1},A_{2}: : and: : A_{3}$, respectively by joining the parallel sides along the breadth. Then,